Terms of Use

The terms under which Kiln is provided.

Kiln Terms of Use

Last updated: 2026-04-24 · Version 2.5

Plain-English summary — These terms govern your use of Kiln, operated by Hadron Labs Inc. Kiln has two sides:

  1. Locally-installed software — the CLI, the MCP server, slicing, printer control, and fulfillment routing all run on your machine. We can't see that data. You're responsible for what you print, for printer safety, and for the actions of any AI agent you authorize to drive the MCP tools.
  2. The web workshop at app.kiln3d.com — a git-style cloud layer for 3D designs: versioned designs, branches, commits, PR-style reviews, releases, cherry-picks, and team collaboration via orgs. What you push here lives on our servers.

We provide the software "as is," cap our liability, and require binding arbitration for disputes (with a 30-day opt-out and small-claims exception). If any of that is a dealbreaker, don't use Kiln.

One inbox, transparent by design. Every "email us at…" reference in these Terms routes to adam@kiln3d.com. Kiln is a small team; one founder reads everything. Put the topic in the subject line so the right thing gets prioritized (e.g., [DMCA], [Arbitration Opt-Out], [Billing], [Security]).

1. The agreement

These Terms of Use (the "Terms") form a binding legal agreement between you and Hadron Labs Inc., a Delaware corporation with its principal place of business in California ("Kiln", "we", "us", or "our"). By downloading, installing, accessing, or using any part of the Kiln software or services — including the open-source Kiln CLI, the MCP server, the web workshop at app.kiln3d.com, the REST API at api.kiln3d.com, the marketing site at kiln3d.com, and any paid tier subscription — you agree to these Terms. If you don't agree, don't use Kiln.

If you are using Kiln on behalf of an organization, you represent that you have authority to bind that organization, and "you" refers to both you personally and the organization.

These Terms incorporate our Privacy Policy by reference.

2. Eligibility

You may use Kiln only if:

  1. You are at least 16 years old (EU/UK) or at least 13 years old (other jurisdictions), and of legal age to form a binding contract in your jurisdiction;
  2. You are not barred from using Kiln under the laws of the United States or the laws of your country of residence (including the export controls and sanctions restrictions in §19);
  3. You are not located in, organized under the laws of, or a resident of a country or territory subject to US comprehensive sanctions (currently: Cuba, Iran, North Korea, Syria, Russia, Belarus, the Crimea region of Ukraine, the Donetsk and Luhansk regions, and any others added by OFAC); and
  4. You are not on the US Specially Designated Nationals (SDN) List, the Entity List, or any equivalent restricted-parties list maintained by any other government.

You are responsible for complying with all applicable laws in your jurisdiction, including laws governing manufacturing, intellectual property, export controls, product safety, consumer protection, and privacy.

3. Your account

3.1 Account creation

Paid tiers and the web workshop require an account. You create one by signing in via Google, Apple, GitHub, or an email magic link. We rely on these identity providers to verify your email address; you must ensure the email tied to your OAuth identity is current and accessible.

3.2 Account security

You are responsible for:

  • Keeping your account credentials and session tokens confidential;
  • All activity that occurs under your account, whether or not authorized by you — including all actions taken by AI agents you have configured or authorized;
  • Promptly notifying us at adam@kiln3d.com if you suspect unauthorized access.

We are not liable for losses arising from your failure to secure your account.

3.3 One account per person or organization

You may not create multiple accounts to evade quotas, rate limits, fee tiers, the fulfillment free-tier allowance, or any other system limit. We may suspend or terminate accounts created in bad faith to circumvent restrictions.

4. License to use Kiln

4.1 Open-source components

The Kiln CLI, the MCP server, and the public tool surface are released under the GNU Affero General Public License v3.0 (AGPL-3.0). Your rights and obligations for that code are governed by the license text in the LICENSE file of the Kiln repository. These Terms do not restrict the rights granted to you by AGPL-3.0 for that code.

4.2 Paid services

Subject to your compliance with these Terms and payment of applicable fees, Hadron Labs Inc. grants you a limited, non-exclusive, non-transferable, non-sublicensable, revocable license to access and use:

  • the web workshop at app.kiln3d.com,
  • the REST API at api.kiln3d.com,
  • the paid tier features unlocked by your subscription, and
  • the proprietary components of the Kiln platform that are not released under AGPL-3.0 (including kiln-pro and the orchestration infrastructure)

for your internal business or personal use. You may not sublicense, resell, or redistribute the paid services except as expressly permitted in writing by us.

4.3 Reserved rights

All rights not expressly granted are reserved. The Kiln name, the kiln-arch logomark, the kiln3d.com and app.kiln3d.com domain trade dress, and all other Kiln brand assets are the trademarks of Hadron Labs Inc. You may not use them without our prior written permission, except for nominative fair use (e.g., referring to the product in documentation or articles).

5. Subscriptions, billing, and refunds

5.1 Paid tiers

Kiln offers paid subscription tiers (currently Pro, Business, and Enterprise). Tier features, limits, and prices are listed at kiln3d.com/pricing. We may change tier features or pricing with at least 30 days' notice to your account email; changes take effect at your next renewal.

5.2 Auto-renewal

Unless you cancel before the renewal date, your subscription automatically renews at the end of each billing cycle (monthly or annual, depending on the plan you chose) and your payment method is charged the then-current price. This is the same model used by services like Netflix, Spotify, and GitHub. You authorize Hadron Labs Inc. (via Stripe) to charge your payment method on each renewal until you cancel.

5.3 Cancellation

You can cancel your subscription at any time via /app/settings/billing or by emailing adam@kiln3d.com. Cancellation takes effect at the end of the current paid period — you retain access through the period you've already paid for. We do not issue pro-rated refunds for partial billing periods (see §5.6 for exceptions).

5.4 Failed payments and dunning

If a renewal charge fails, we will:

  1. Notify you by email immediately;
  2. Automatically retry the charge up to 4 times over 15 days;
  3. Grace your entitlement for up to 15 days from the failed charge — your tier remains active while we retry;
  4. Mark the entitlement as "payment_failed" after 15 days, which reverts you to the free tier until payment is resolved;
  5. Cancel the subscription after 30 days of continuous failure.

You can update your payment method at any time via the Stripe billing portal, accessible from /app/settings/billing.

5.5 Free trials

Any free trial we offer will clearly state its duration and the recurring charge that begins at its end. You must cancel before the trial ends to avoid being charged. One free trial per customer.

5.6 Refunds

  • Monthly subscriptions: non-refundable except where required by law. Cancel to stop future charges.
  • Annual subscriptions: refundable within 14 days of the initial charge for any reason, pro-rated for the days used. After 14 days, non-refundable.
  • Fulfillment orchestration fees: if a fulfillment order fails during manufacturing or is cancelled by the provider, we refund the orchestration fee automatically. For delivery defects, contact the manufacturer for a reprint or refund of the manufacturing cost; we refund the orchestration fee upon confirmation the provider has issued their refund.
  • Refund requests must be made within 30 days of the original charge.
  • Refunds are processed through the original payment method and may take 3–10 business days to appear on your statement.

5.7 Chargebacks

If you dispute a charge directly with your bank or card network without first contacting us, we may suspend or terminate your account while the chargeback is resolved. Before initiating a chargeback, please email adam@kiln3d.com — we almost always resolve billing issues without card-network involvement.

5.8 Spend caps on fulfillment orders

To protect you from runaway charges — including charges caused by an AI agent or automated workflow misfiring — we cap how much you can spend through Kiln on external fulfillment (Craftcloud and any future fulfillment provider routed through Kiln):

  • Per-order cap: a single fulfillment order may not exceed $500.00 USD, summing the manufacturing provider's quoted price and any orchestration fee charged under §6.
  • Monthly cap: your cumulative fulfillment spend in any calendar month (UTC) may not exceed $2,000.00 USD, summed over every fulfillment order placed that month, including each order's manufacturer total and orchestration fee.

If a job would exceed either cap, Kiln refuses the order before any charge is created. You receive a clear error identifying which cap was reached; nothing is deducted from your card.

These caps apply to all paid tiers and protect your downside only — they do not commit Kiln to any minimum order size, nor guarantee that an order under the cap will be accepted. We may adjust these caps in future versions of these Terms under the change-notification rules in §22; an increase or decrease is a material change and will be communicated at least 30 days before it takes effect.

Adjusting your caps from the web. Paid users can raise either cap above the default through the web app at app.kiln3d.com/settings/billing/spend-caps. Cap raises require two-factor authentication and are limited to values at or above the protective default ($500 / $2,000); you may not lower a cap below those defaults.

Adjusting your caps from the CLI or an MCP agent (opt-in). Power users can opt in to a CLI/MCP path under the same web-app settings page, by enabling Allow CLI / MCP cap changes. When opt-in is enabled, the same two-factor challenge is required for every change — your CLI or AI agent will display the requested change and ask you for the current 6-digit code from your authenticator app. The opt-in toggle itself can only be flipped from the web app and itself requires two-factor authentication.

Rate limit and lockout. Cap-change attempts are rate-limited across all surfaces: a maximum of three attempts in any rolling 24-hour window. The third attempt (whether successful or not) pauses further cap-change requests for 24 hours and triggers an email to your account with the attempt details. This protects you against a compromised agent or session.

Audit and revert. Every change is logged with the surface ('web', 'cli', or 'mcp'), an IP, and a user-agent string. Each change triggers an email confirmation with a 24-hour revert link. No agent can self-approve an order or raise a cap without your authenticator code — possession of your second factor is the load-bearing security primitive across every surface.

Per-order one-shot approvals. When an order would exceed your standing caps, Kiln refuses it with a clear error containing an approve_url. From the web — or from your CLI/MCP if opt-in is enabled — you can mint a single-use, 5-minute approval token bound to that specific order; the agent then resubmits the order with the token and the cap is bypassed for that order only.

6. Orchestration fees for fulfillment

When you route a print job to an external fulfillment provider through Kiln, we charge an orchestration fee for order routing, provider management, status tracking, and platform infrastructure:

  • Orchestration fee: 5% of the manufacturing provider's quoted price
  • Minimum fee: $0.25 per order
  • Maximum fee: $200.00 per order
  • Free tier: your first 3 fulfillment orders each calendar month are fee-free

Fees are charged at the time the order is placed with the manufacturing provider. Local printing — on your own printers, using your own materials — is and will remain free. We never charge for file management, slicing, status monitoring, or any other operation that doesn't involve an external manufacturer.

7. Applicable taxes

Depending on your jurisdiction, applicable taxes (sales tax, VAT, GST, or JCT) may be added to subscription fees and orchestration fees:

Jurisdiction Tax Reverse charge available?
United States State sales tax (CA, TX, NY, WA, FL, IL, MA and others per nexus) No
European Union VAT at buyer's country rate (19–25%) Yes, with valid EU VAT ID
United Kingdom 20% VAT Yes, with valid UK VAT number
Canada Federal GST (5%) + applicable provincial tax (HST / PST / QST) No
Australia 10% GST Yes, for GST-registered buyers
Japan 10% JCT (consumption tax) Yes

Tax on orchestration fees is calculated on the orchestration fee only, not on the manufacturing cost. The manufacturing provider is responsible for any taxes on their charges.

Preview the tax for any order with the tax_estimate tool before placing it. We display the full fee + tax breakdown before charging. No hidden fees.

8. Your responsibilities — 3D printing safety

By using Kiln you acknowledge and agree that:

  1. You are responsible for what you print. Kiln does not monitor, filter, or restrict the geometry of files you download, generate, slice, or send to your printer. The decision to print any object is yours alone. You are responsible for ensuring that every object you produce complies with applicable laws — including laws governing firearms, weapons, regulated medical devices, automotive safety parts, and intellectual property (patent, trademark, copyright, and trade secret laws).

  2. You are responsible for printer safety. Kiln includes safety systems that enforce physical limits — temperature caps, speed limits, G-code validation, bed-boundary checks, and blocked command detection. These reduce risk; they do not eliminate it. Unattended 3D printing carries inherent fire and mechanical hazards. Follow your printer manufacturer's operating, maintenance, and safety guidelines. Keep a working smoke detector and fire extinguisher near any unattended printer.

  3. You are responsible for maintaining your printer. Well-maintained hardware is a prerequisite for any of Kiln's safety checks to work. Worn thermistors, loose wiring, improperly-levelled beds, and degraded hotends are outside Kiln's ability to detect.

9. Automated control risks — AI-agent operation

This section is deliberately prominent because it describes the risk profile of Kiln's most distinctive feature.

Kiln exposes tools over the Model Context Protocol (MCP) that third-party AI agents — such as Claude, Claude Code, Cursor, and other MCP clients — can invoke to perform physical operations on your printer, including homing, motion, heating, extrusion, bed levelling, file uploads, and unattended print execution. Kiln agents may initiate printer motion, heating, and material extrusion autonomously based on your instructions or inferred intent. These agents operate on your behalf under your configuration; Kiln does not select, direct, or supervise them.

Kiln validates tool inputs and refuses unsafe operations where they are deterministically detectable (off-bed geometry, missing homing sequences, temperatures exceeding the printer's mechanical limits, G-code with blocked commands, blocked command dialects). These validations reduce but do not eliminate the risk of physical harm. Kiln cannot and does not guarantee that the invoking agent will call tools correctly, in the correct sequence, or in accordance with your intent.

You remain solely responsible for:

  • Reviewing previews and agent-proposed actions before confirming them.
  • Supervising unattended prints.
  • Any physical damage, personal injury, lost work, or loss of equipment arising from agent behavior or misbehavior — including agents making mistakes, misinterpreting your intent, or invoking tools in harmful sequences.
  • Complying with your printer manufacturer's operating, maintenance, and safety guidelines.

Hadron Labs Inc. assumes no liability for agent actions, agent errors, agent misinterpretation of user intent, or any physical, financial, or other consequences arising from the automated execution of tools in this software. This disclaimer is in addition to §15 (Disclaimer of Warranties) and §16 (Limitation of Liability).

10. Acceptable use

You agree not to use Kiln to:

  1. Violate any applicable law, regulation, sanction, or third-party right.
  2. Manufacture items that are illegal in your jurisdiction, including firearms, firearm components, firearm accessories that are regulated in your jurisdiction, counterfeit currency, counterfeit goods, counterfeit trademarks, or items that infringe the intellectual-property rights of others.
  3. Manufacture medical devices, automotive safety parts, aerospace components, structural load-bearing parts, or other items subject to certification requirements you have not met.
  4. Print objects depicting child sexual abuse material (CSAM) or other content illegal under the laws of the United States.
  5. Circumvent Kiln's safety systems, rate limits, entitlement checks, authentication, or other technical protection measures.
  6. Reverse-engineer, decompile, or attempt to derive the source code of proprietary (non-AGPL) components of Kiln, except to the extent such restrictions are prohibited by applicable law.
  7. Use Kiln to build a product that directly competes with Kiln without a separate written agreement.
  8. Resell access to Kiln or the paid services to third parties without our written authorization.
  9. Interfere with or disrupt the integrity or performance of Kiln's services, including through denial-of-service attacks, malicious code, or attempts to gain unauthorized access.
  10. Scrape, harvest, or otherwise collect data from other users — including bulk-downloading other people's designs, branches, versions, PR comments, reflog entries, or org membership rosters.
  11. Impersonate another person, entity, or Kiln representative — including in PR descriptions, commit messages, branch names, comments, or org invites.
  12. Send spam, bulk unsolicited messages, or any content that violates the acceptable-use policies of integrated third parties (Google, Apple, GitHub, Stripe, Circle, Craftcloud, MyMiniFactory, Cults3D).
  13. Abuse the workshop's collaboration features: sending unsolicited org or team invites, forking designs to harass their authors, opening PRs in bad faith, or using reflog access to build profiles of other users' activity patterns.
  14. Use the opt-in community datasets (community_prints, community_recoveries) to attempt to re-identify or fingerprint individual contributors.
  15. Circumvent the workshop's permission model — attempting to read or modify designs, branches, versions, or org data you have not been granted access to by the owner or by your role.

We may suspend or terminate your account for violations of this §10 without prior notice where we believe an immediate response is needed to protect users or third parties.

11. Your content and intellectual property

11.1 Your content stays yours

You retain all right, title, and interest in and to the files, models, prompts, configurations, branches, version commits, PR descriptions, PR comments, release notes, cherry-picks, features, presets, and every other artifact you upload to or generate with Kiln ("Your Content"). We do not claim ownership of Your Content. When you push a new version of a design to the web workshop's git-for-3D layer, you own every commit in the history just like you'd own every commit you push to a personal GitHub repo.

11.2 The license you grant to us

To operate the service on your behalf, you grant us a worldwide, non-exclusive, royalty-free, sub-licensable license to host, store, copy, transmit, process, and modify Your Content solely to the extent necessary to provide the Kiln service to you — for example:

  • storing your commit history in the git-for-3D cloud layer so you can pull past versions;
  • auto-generating thumbnail previews so you can browse your library visually;
  • propagating commits, branches, PR comments, and releases to collaborators you have explicitly granted access to via an org or team role;
  • routing a model file to a fulfillment provider you selected;
  • storing slicer configurations, features, or presets you choose to save to the cloud;
  • retaining event logs for debugging.

This license ends when Your Content is deleted, subject to our legitimate retention requirements documented in the Privacy Policy (backups, legal holds).

We will not use Your Content to train machine-learning models, to generate derivative products, for marketing, or for any purpose other than operating the service for you — unless you explicitly opt in via a clearly-labeled consent flow. Today we have no ML pipeline trained on user content, and we are not collecting data for that purpose. If we ever build one (for example, to improve slice-quality prediction or failure-mode detection), we will ask your permission first and let you decline without losing any features. This commitment is stronger than the industry norm because Kiln is built by and for people who care about IP ownership of what they design and print.

11.3 Your representations about Your Content

You represent and warrant that you have all rights necessary to upload and use Your Content through Kiln, and that Your Content does not infringe any third party's IP rights, violate any law, or breach any agreement you are subject to.

11.4 Designs owned by organizations

When you create or push to a design that belongs to an organization (an "Org Design"), the design itself is owned by the organization, not by you personally — even if you authored individual commits to it. While you are a member of the org:

  • You can push, pull, open PRs, comment, and release per the role the org's admin has granted you;
  • Your individual commits remain attributed to you in the reflog and version history (the "authorship" of each commit);
  • The underlying design files belong to the org and cannot be extracted by you alone.

When you leave an org (or are removed):

  • Your access to the org's designs ends immediately;
  • Your authorship attribution on prior commits remains in the history, so collaborators can see who wrote which part (standard git-style audit trail);
  • On your written request, we will anonymize your authorship on Org Design commits — we replace your name with "a former collaborator." We cannot remove your commits from the history without destroying other contributors' work, so we do not offer that.

Ownership of the org itself (and any Org Designs) transfers to the remaining admins if you, as owner, leave. If no admin remains, the org enters a 30-day wind-down period during which a new owner can be appointed; if none is, the org and all its designs are permanently deleted.

11.5 Public designs and the community datasets

If Kiln adds a "make design public" feature in the future, and you explicitly opt in to making a design public, you grant Kiln and other users a non-exclusive right to view and clone the public version of that design, subject to any license you attach to it (e.g., CC-BY-NC-SA, MIT, proprietary). You remain the copyright owner; public sharing does not transfer ownership.

If you opt in to contribute to the community datasets (community_prints, community_recoveries) by explicitly calling a community_share tool, you grant Kiln and every user a perpetual, irrevocable, royalty-free, worldwide license to use the anonymized contribution for research, training of success-rate models, and aggregate analytics that benefit the Kiln user community. The ingestion pipeline strips your email, auth_user_id, tenant_id, file names, and geometry before storage — only printer model, material, settings hash, outcome, and quality grade are retained. Because the data is anonymized at ingestion, we cannot identify or retract individual contributions once they're in the dataset. Only opt in if you are comfortable with permanent donation of that (anonymized) record.

11.6 Feedback

If you submit feedback, feature requests, or suggestions to us ("Feedback"), you grant us a perpetual, irrevocable, royalty-free, worldwide license to use Feedback for any purpose without obligation. Don't send us Feedback you want to keep proprietary.

12. Third-party services and content

Kiln connects to third-party services — Google / Apple / GitHub OAuth, Stripe, Circle, Supabase, Fly.io, Vercel, Craftcloud, MyMiniFactory, Cults3D, and others. Your use of those services is subject to each provider's own terms of use and privacy policy. We are not a party to the contract between you and any third-party service, and we are not responsible for acts, omissions, content, or availability of third-party services.

Content downloaded from third-party marketplaces is governed by the respective marketplace's terms and the licenses attached to individual listings. You are responsible for verifying the license on any model you download before you print, sell, or redistribute it.

If you believe content accessible through Kiln infringes your copyright, send a notice under the Digital Millennium Copyright Act (17 U.S.C. §512) to our designated agent:

DMCA Agent, Hadron Labs Inc. Email: adam@kiln3d.com

Your notice must include all elements required by §512(c)(3):

  1. Physical or electronic signature of the copyright owner or authorized agent;
  2. Identification of the copyrighted work claimed to be infringed;
  3. Identification of the infringing material and information reasonably sufficient to let us locate it (including URL);
  4. Your contact information;
  5. A statement that you have a good-faith belief that the use is not authorized by the copyright owner, its agent, or the law;
  6. A statement, under penalty of perjury, that the information in the notice is accurate and that you are authorized to act on behalf of the copyright owner.

Counter-notices may be sent to the same email and must include the elements required by §512(g)(3).

We will respond to valid DMCA notices by removing or disabling access to the identified material and will terminate the accounts of users who are repeat infringers.

14. Suspension and termination

14.1 By you

You can terminate your account at any time via /app/settings/account → Delete account or by emailing adam@kiln3d.com. Termination cancels all active subscriptions effective at the end of the current paid period.

14.2 By us

We may suspend or terminate your account, without prior notice, if:

  1. You materially breach these Terms (including §10 Acceptable Use);
  2. You pose a security risk to us or other users;
  3. We are required to do so by law or by an order of a court or governmental authority;
  4. Your account has been inactive for 12+ months and has no active paid subscription;
  5. We discontinue the service or any part of it — we will provide at least 90 days' notice for a full discontinuation.

For non-urgent violations, we will provide notice and a reasonable opportunity to cure where practicable.

14.3 Effect of termination

On termination, the following cascade applies:

Access:

  • Your access to paid services ends immediately;
  • Access to org-owned designs via any org you were a member of ends immediately;
  • Sessions on every device are invalidated.

Your personal designs and workshop content:

  • All designs, branches, versions, releases, cherry-picks, features, presets, and related metadata that you personally own (not org-owned) are retained for 90 days in case you reinstate. After 90 days they are permanently deleted along with your account.

Org-owned designs (where you contributed):

  • Org-owned designs remain with the org. Your individual commits remain attributed to you in the history (like GitHub); the org's admins can request anonymization of your authorship (replacing your name with "a former collaborator") per §11.4.
  • Orgs that you personally own transition to the remaining admins or enter a 30-day wind-down per §11.4.

PR comments on others' designs:

  • Comments you posted on others' PRs remain visible on the host design's history to preserve review context. On written request to adam@kiln3d.com we will anonymize your authorship.

Community dataset contributions:

  • Anonymized contributions to community_prints and community_recoveries remain in the dataset — they cannot be retracted because we can't trace records back to you after ingestion (see §11.5).

Billing:

  • Outstanding charges remain due;
  • Refunds are governed by §5.6;
  • Invoices and payment records are retained per Privacy Policy §7 retention schedule (7 years for tax compliance).

Surviving sections:

The following Sections survive termination: §4.3 (reserved rights), §5.6 (refunds), §5.7 (chargebacks), §8 (your responsibilities), §9 (automated control risks), §11.4 (org designs + authorship attribution), §11.5 (public + community data licenses), §11.6 (feedback), §15 (warranties), §16 (liability), §17 (indemnification), §19 (export), §20 (governing law), §21 (arbitration), §23 (notices), §24 (general).

15. Disclaimer of warranties

KILN, THE WEB WORKSHOP, THE REST API, THE CLI, THE MCP SERVER, THE PAID SERVICES, AND ANY CONTENT, TOOLS, OR INTEGRATIONS MADE AVAILABLE THROUGH THEM ARE PROVIDED "AS IS" AND "AS AVAILABLE" WITHOUT WARRANTIES OF ANY KIND, WHETHER EXPRESS, IMPLIED, OR STATUTORY.

Without limiting the foregoing, we expressly disclaim all warranties of merchantability, fitness for a particular purpose, non-infringement, quiet enjoyment, system integration, accuracy, title, and any warranties arising from a course of dealing, usage, or trade practice.

We do not warrant that:

  • The service will be uninterrupted, secure, or error-free;
  • Defects will be corrected;
  • The service will meet your requirements;
  • Any data will be preserved against loss or corruption;
  • AI-agent actions will be correct, safe, or in accordance with your intent.

Some jurisdictions do not allow exclusion of certain implied warranties; in those jurisdictions, the exclusions above apply to the maximum extent permitted by law.

16. Limitation of liability

TO THE MAXIMUM EXTENT PERMITTED BY LAW:

  1. Excluded damages. Hadron Labs Inc., its officers, directors, employees, contractors, and affiliates will not be liable for any indirect, incidental, consequential, special, exemplary, or punitive damages, including lost profits, lost revenue, lost data, lost goodwill, loss of anticipated savings, business interruption, or procurement of substitute goods or services, even if we have been advised of the possibility of such damages.

  2. Liability cap. Our total cumulative liability to you arising out of or related to these Terms or your use of Kiln, for all claims of every kind, will not exceed the greater of (a) $100 USD, or (b) the fees you paid to us in the 12 months preceding the event giving rise to the claim.

  3. 3D printing + AI-agent physical harm. To the extent permitted by law, the limitations in (1) and (2) above apply to any claim arising from physical damage, property loss, personal injury, or death caused by printer operation, AI-agent actions, fulfillment orders, or any other operation of Kiln. Some jurisdictions do not permit the exclusion or limitation of liability for personal injury or death caused by negligence; in those jurisdictions, our liability is limited only to the extent permitted by law.

  4. Essential bargain. You understand and agree that the limitations in this §16 are an essential element of the bargain between you and us, and that absent these limitations we would not provide the service at the fees we charge or at all.

17. Indemnification

You agree to defend, indemnify, and hold harmless Hadron Labs Inc., its officers, directors, employees, contractors, and affiliates from and against any claims, damages, losses, liabilities, costs, and expenses (including reasonable attorneys' fees) arising out of or related to:

  1. Your use or misuse of Kiln;
  2. Your Content or the objects you manufacture;
  3. Your violation of these Terms, including §10 (Acceptable Use);
  4. Your violation of any applicable law or third-party right;
  5. Actions taken by AI agents you authorized or configured;
  6. Your failure to supervise unattended prints or follow printer manufacturer guidance.

We reserve the right to assume the exclusive defense and control of any matter subject to indemnification by you, at your expense. You agree to cooperate with our defense of any claim.

18. Representations by you

You represent and warrant, on each date you use Kiln, that:

  1. You have full legal right and authority to enter into these Terms;
  2. All information you provide to us is accurate, current, and complete;
  3. You will use Kiln in compliance with these Terms and applicable law; and
  4. Neither you nor any entity on whose behalf you use Kiln is located in a sanctioned jurisdiction (§2) or listed on any restricted-parties list (§19).

19. Export controls and sanctions

Kiln is subject to US export control laws, including the Export Administration Regulations (15 C.F.R. §§ 730–774) and the economic-sanctions programs administered by the US Treasury Department's Office of Foreign Assets Control (OFAC).

You agree that you will not — directly or indirectly — export, re-export, transfer, or release Kiln or any of its technical data:

  1. To any country, entity, or person subject to US sanctions or export restrictions listed in §2;
  2. For any use prohibited under US export laws, including the design or production of nuclear, chemical, or biological weapons, missile technology, or unmanned aerial vehicles; or
  3. In contravention of export or import laws of your own jurisdiction.

You are responsible for obtaining any licenses or authorizations required for your use of Kiln under the laws applicable to you.

20. Governing law

These Terms, and any dispute arising out of or related to these Terms or your use of Kiln, are governed by the laws of the State of Delaware, USA, without regard to its conflict-of-laws rules. The United Nations Convention on Contracts for the International Sale of Goods does not apply.

21. Binding arbitration and class-action waiver

READ THIS SECTION CAREFULLY — IT AFFECTS YOUR LEGAL RIGHTS, INCLUDING YOUR RIGHT TO FILE A LAWSUIT IN COURT.

21.1 Agreement to arbitrate

You and Hadron Labs Inc. agree that any dispute, claim, or controversy arising out of or relating to these Terms, the Privacy Policy, Kiln, or the relationship between you and us (a "Dispute") will be resolved by binding arbitration conducted by the American Arbitration Association (AAA) under its Consumer Arbitration Rules (or, for Business or Enterprise tier customers, its Commercial Arbitration Rules), as modified by this §21.

The arbitration will be conducted in San Francisco County, California, USA, unless you and we agree otherwise. For individual consumer claims under $10,000, at your option, you may elect to participate in the arbitration by telephone, videoconference, or written submission only (no in-person appearance required). A single arbitrator will preside.

The arbitrator will issue a reasoned written award, which is final and binding. Judgment on the award may be entered in any court of competent jurisdiction.

21.2 Small-claims exception

Either you or we may bring an individual claim in small-claims court in a jurisdiction where both parties are subject to personal jurisdiction, so long as the claim remains in small claims. If a small-claims case is transferred, removed, or appealed outside of small-claims court, this §21 resumes and the case must continue in arbitration.

21.3 Class-action waiver

YOU AND WE EACH AGREE THAT CLAIMS MAY BE BROUGHT ONLY IN YOUR OR OUR INDIVIDUAL CAPACITY, AND NOT AS A PLAINTIFF OR CLASS MEMBER IN ANY PURPORTED CLASS, COLLECTIVE, CONSOLIDATED, PRIVATE ATTORNEY GENERAL, OR REPRESENTATIVE PROCEEDING. The arbitrator may not consolidate the claims of more than one person and may not preside over any form of class or representative proceeding. If this class-action waiver is found unenforceable, then the entire §21 (except the small-claims exception) will be null and void, but the remainder of these Terms will continue to apply.

21.4 30-day opt-out right

You can opt out of this arbitration agreement by emailing adam@kiln3d.com within 30 days of first accepting these Terms (or of first accepting any material change to this §21). Include your name, email, and a clear statement that you opt out of the arbitration agreement. Opting out does not affect any other part of these Terms.

If you opt out, all Disputes between you and us will be resolved in the state or federal courts located in Delaware (or, at your option for consumer claims, in the state or federal courts located in your district of residence), and you and we consent to the personal jurisdiction of those courts.

21.5 Federal Arbitration Act

These arbitration provisions are governed by the Federal Arbitration Act (9 U.S.C. § 1 et seq.) and federal arbitration law. They will remain in effect after termination of these Terms or your account.

21.6 Fees

For consumer claims of $10,000 or less, Hadron Labs Inc. will pay all AAA filing, administration, and arbitrator fees. For larger claims, AAA's standard fee allocation applies, and either party may seek fee-shifting per applicable law.

21.7 Injunctive relief carve-out

Either party may bring an action in court — without first arbitrating — to protect its intellectual property rights or to prevent unauthorized access to the service (injunctive relief only). Any damages claim remains subject to §21.1.

22. Changes to these Terms

We may update these Terms from time to time. When we make changes, we will:

  1. Update the "Last updated" date and increment the version number at the top;
  2. Preserve prior versions in public Git history at github.com/codeofaxel/Kiln/blob/main/TERMS_OF_USE.md;
  3. For material changes (changes to fees, cancellation terms, liability, arbitration, acceptable-use restrictions, or other terms that meaningfully affect your rights), email you at the address on your account at least 30 days before the change takes effect, and require re-acceptance during your next signin if possible.

Continued use of Kiln after the effective date of a change constitutes acceptance of the revised Terms. If you don't agree with a change, cancel your subscription before the effective date.

23. Notices

We communicate with you via the email address on your account. It is your responsibility to keep that email current and accessible. Notices from us are deemed received when sent to your account email.

You may send notices to us at:

Hadron Labs Inc., Legal Department Email: adam@kiln3d.com Postal mail: Hadron Labs Inc., c/o Harvard Business Services, Inc. (Registered Agent), 16192 Coastal Hwy, Lewes, DE 19958, USA

Notices are effective on receipt.

24. General

24.1 Entire agreement

These Terms (together with the Privacy Policy, any DPA, and any other agreements expressly incorporated by reference) constitute the entire agreement between you and us regarding Kiln and supersede all prior or contemporaneous understandings.

24.2 Severability

If any provision of these Terms is held to be invalid or unenforceable, that provision will be struck or modified only to the minimum extent necessary, and the remaining provisions will remain in full force and effect.

24.3 No waiver

Our failure to enforce any provision is not a waiver. A waiver is effective only if in writing signed by an authorized representative of Hadron Labs Inc.

24.4 Assignment

You may not assign or transfer these Terms or any rights or obligations hereunder without our prior written consent. We may assign these Terms in connection with a merger, acquisition, reorganization, sale of assets, or by operation of law.

24.5 No agency; no third-party beneficiaries

Nothing in these Terms creates a partnership, agency, joint venture, or employment relationship between you and us. There are no third-party beneficiaries to these Terms.

24.6 Force majeure

Neither party is liable for failure or delay in performance caused by acts beyond its reasonable control, including acts of God, natural disasters, war, terrorism, civil unrest, labor actions, government actions, internet or telecommunications failures, power outages, and pandemics. The affected party will notify the other and use reasonable efforts to resume performance.

24.7 Headings; interpretation

Headings are for convenience only and do not affect interpretation. "Including" means "including without limitation." References to "you" and "we" include successors and permitted assigns.

24.8 Language

These Terms are drafted in English. Any translation is provided for convenience, and the English version controls in the event of inconsistency.

24.9 US Government rights

If you are a US Government end user, Kiln and its documentation are "Commercial Items" as defined in FAR 2.101, consisting of "Commercial Computer Software" and "Commercial Computer Software Documentation" per 48 C.F.R. 12.212 and 48 C.F.R. 227.7202. Consistent with those provisions, Kiln is licensed to US Government end users only as Commercial Items and with only those rights granted to all other end users under these Terms.

25. Contact

By using Kiln, you confirm that you have read, understood, and agreed to these Terms of Use.