You say yes to each step
Gemini shows what it wants Kiln to do and waits for you to allow it, so nothing runs that you didn’t see first.
Kiln in Gemini
Let Gemini run your 3D printer.
Kiln gives Gemini what it needs to design a part, check it will print, and run it on your own printer. You approve every step.
From the chat to your hands in 3D
Gemini asks before each Kiln step, then hands you a link. One tap and the part you asked for is on Kiln’s 3D stage, ready to turn over.
Turn the model over
The link opens the part on Kiln’s 3D stage. Drag to rotate, switch views, and check the bottom before anything prints.
A check before it prints
Kiln checks the part will print and fits your printer, and flags what is likely to go wrong. With Kiln Pro, it also says exactly what to change.
The 3D link lasts about half an hour. Starting and watching a print needs Kiln installed on the computer next to your printer.
An example conversation
@Kiln design a clip that holds a 6 mm cable to the edge of my desk, and show it to me in 3D.
You allow each Kiln step
Done. Here’s the link to see it in 3D.
The clip opens on Kiln’s 3D stage
Print two.
They’re waiting for your OK in the approval prompt.
You approve it
Printing two clips. Ask me any time how it’s going.
What Kiln adds
Gemini can write the code. Kiln turns it into a part.
The same job both ways, from a description to a part on your printer.
| Step | Gemini on its own | Gemini with Kiln |
|---|---|---|
| Make it | Writes CAD code. Seeing the shape takes a CAD program on your computer. | Kiln builds the model and hands you a link that opens it in 3D. |
| Check it | A problem shows up in the slicer, or partway through the print. | Kiln checks overhangs, thin walls, warping risk, and whether it fits your printer, before anything prints. |
| Change it | Ask again and get new code. Keeping track of which version was better is on you. | Ask for a change in the same chat, and Kiln keeps every try tied to what you first asked for. Pro makes it Git for 3D: what changed, drawn on the part, and a branch for the risky idea. |
| Slice it | Export the file, open your slicer, and pick the settings. | Kiln slices it in the slicer you already have: PrusaSlicer, OrcaSlicer, or Bambu Studio.Kiln on your computer |
| Print it | Send the file to your printer yourself. | Gemini sends it to your printer, and it starts only after you say yes.Kiln on your computer |
| Watch it | Check on it in the printer’s own app. | Kiln watches every print it starts and stops it if a heater fails. Watch it live on kiln3d.com/monitor, with the camera, progress, and pause and stop, or ask Gemini how it’s going.Kiln on your computer |
| More printers | You run each one yourself. | Business runs several at once and picks the printer for each job. Free and Pro drive one at a time. |
Steps marked “Kiln on your computer” need Kiln installed on the computer next to your printer. The camera shows when your printer has one. A print can still fail, with Kiln or without it; Kiln catches what it can see before the print starts, and asks before it uses your plastic.
Set it up
Two minutes on gemini.google.com. Nothing to install until you want your own printer in the loop.
Add Kiln as a custom app
On gemini.google.com, open Settings, then Connected apps, and add a custom app. Paste Kiln’s address.
https://api.kiln3d.com/mcpSign in to Kiln
Gemini opens Kiln’s sign-in when you add it. Sign in or make a free account, and Kiln shows in your connected apps. How the connector works.
Ask for what you want
In a new chat, type @, pick Kiln, and describe a part. Gemini asks before each Kiln step, then hands you a link that opens the model in 3D.
To print, add your printer
Install Kiln on the computer next to your printer. Gemini can then send a print to it, and you approve every one. Install Kiln. See the printers Kiln works with.
Before it prints, Kiln asks you
A print uses real plastic on a real machine, so Gemini can’t start one alone. Kiln shows you the model, then waits for your yes in an approval prompt. You can say yes to one printer for a while so it stops asking, and end that whenever you like.
Questions
Can Gemini 3D print?
Yes, with Kiln. Describe a part in Gemini; Kiln designs it, checks it will print, and hands back a link that opens it in 3D in your browser. To print, install Kiln on the computer next to your printer; Gemini then sends the print there and you approve it. Tested in Gemini on the web.
Can Gemini make 3D models?
Yes. With Kiln connected, Gemini turns a plain description into a real 3D model you can turn over, measure and change in the same chat, then print or download. No CAD skills needed.
What does Kiln add to Gemini?
Gemini can write the code for a 3D model. Kiln builds it, hands you a link that opens it in 3D, checks it will print (overhangs, thin walls, warping, and whether it fits your printer), slices it in your own slicer, and sends it to your printer after you say yes.
Which model works best with Kiln in Gemini?
The most capable one your plan offers. Today that’s Gemini 4 Argon, for Google AI Pro and Ultra subscribers. Kiln does the checking and the printing; the model does the thinking, so a stronger model means better designs and fewer retries.
How do I connect Gemini to my 3D printer?
Add Kiln inside Gemini by its address, https://api.kiln3d.com/mcp, and sign in. Nothing to install. The setup steps on this page take a few minutes.
Do I need a 3D printer?
No. With the connector, Gemini can design a part and check it will print without one. You need a printer, or someone else’s, to make it.
Does the 3D model show inside the Gemini chat?
Not inside the chat. Gemini hands back a link, and the link opens the model on Kiln’s 3D stage in your browser, where you can turn it over and zoom in. The link lasts about half an hour.
Does it work in the Gemini app on my Mac or phone?
Use gemini.google.com. In our tests the Gemini Mac app listed Kiln but didn’t use it. Google says custom apps you connect on the web also work in the Gemini phone app.
Who can add a custom app to Gemini?
Google currently offers custom apps on personal Google accounts, in English, in the US, for people 18 and over. Work and school accounts can’t add them yet.
Will it print without asking me?
No. Gemini asks before each Kiln step, and Kiln waits for your yes before every print. Auto-print is off unless you turn it on.
Which printers does it work with?
Bambu Lab, Creality, Prusa, Elegoo, and most Klipper and OctoPrint machines. The full list is on the supported printers page.
Is Kiln made by Google?
No. Kiln is independent, open-source software you can use from Gemini. It is not affiliated with or endorsed by Google.
Add Kiln to Gemini →Using ChatGPT? →Using Claude? →Using Codex? →Using Cursor? →Using Grok? →Using OpenClaw? →
Kiln is independent, open-source software. It is not affiliated with or endorsed by Google.