Ask in plain words
One sentence was enough. Hermes asked Kiln for a phone stand with a cable slot, and opened it beside the chat to turn over.
Kiln in Hermes Agent
Let Hermes Agent run your 3D printer.
Kiln gives Hermes what it needs to design a part, check it will print, and run it on your own printer. You approve every print.
It opens right beside the chat
Kiln makes the part and hands Hermes a 3D view. Hermes Desktop opens it in its own preview pane, so you see what you asked for before anything prints.
Change it in the same chat
Say what to change, like no supports, and the new version opens in 3D in the next reply. Drag it around to check every side.
A check before it prints
Kiln checks the part will print and flags what is likely to go wrong, before any plastic is spent. With Kiln Pro, it also says exactly what to change.
Works the same from Hermes in the terminal, where Kiln hands back a link to the 3D view. The link lasts about half an hour. Starting and watching a print needs Kiln installed on the computer next to your printer.
An example conversation
Design me a phone stand for my desk with a slot for the charging cable, and show me a 3D preview I can turn around.
The stand opens in 3D beside the chat
Your phone stand is open in the 3D preview beside the chat. If you print it, it will need supports.
Make it print without supports, and make the front lip one solid piece with the cable slot through the middle.
The new stand opens in 3D
Updated. Kiln’s check says no supports needed, and the front lip is one piece with the cable slot through it.
What Kiln adds
Hermes Agent 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 | Hermes Agent on its own | Hermes Agent with Kiln |
|---|---|---|
| Make it | Writes CAD code. Seeing the shape takes a CAD program on your computer. | Kiln builds the model and opens it in 3D beside the chat. |
| 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. Save it to your free Kiln account and it is Git for 3D: every version kept, and a branch for the risky idea. Pro does it on every design and draws what changed on the part. |
| 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. | Hermes Agent 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 Hermes Agent 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 with Hermes Agent installed. Nothing else to install until you want your own printer in the loop.
Add Kiln to Hermes
Run this once in a terminal on the computer where Hermes Agent runs.
hermes mcp add kiln --url https://api.kiln3d.com/mcp --auth oauth --connect-timeout 300Sign in to Kiln
Hermes opens Kiln’s sign-in in your browser. Sign in or make a free account, then say yes when Hermes asks to turn on Kiln’s tools. How the connector works.
Ask for what you want
Describe a part in a new Hermes chat. Kiln designs it, checks it, and Hermes Desktop opens it in 3D beside the chat.
To print, add your printer
Install Kiln on the computer next to your printer. Hermes 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 Hermes can’t start one alone. Kiln shows you the model first, then waits for your yes before every print, and nothing prints without it.
Questions
Can Hermes Agent 3D print?
Yes, with Kiln. Describe a part in Hermes Agent; Kiln designs it, checks it will print, and opens it in a 3D view beside the chat. To print, install Kiln on the computer next to your printer; Hermes Agent then sends the print there and you approve it. Tested in Hermes Desktop and the terminal on a Mac.
Can Hermes Agent make 3D models?
Yes. With Kiln connected, Hermes Agent 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 Hermes Agent?
Hermes Agent can write the code for a 3D model. Kiln builds it, opens it in 3D beside the chat, 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 Hermes Agent?
The most capable one you have connected to Hermes. Hermes runs models from many companies; pick the strongest one in its model menu. 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 Hermes Agent to my 3D printer?
Add Kiln inside Hermes Agent 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, Hermes can design a part and Kiln checks it will print without one. You need a printer, or someone else’s, to make it.
Does the 3D model show inside Hermes?
In Hermes Desktop, yes: Hermes opened Kiln’s 3D view in its preview pane, right beside the chat. Kiln also hands back a link that opens the same view in any browser for about half an hour.
The sign-in timed out. What now?
Run the add command again with --connect-timeout 300, as shown above. Without it, Hermes waited only 30 seconds in our test, which ran out while a two-factor code was being typed.
Will it print without asking me?
No. A print needs Kiln installed on the computer next to your printer, 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 Nous Research?
No. Kiln is independent, open-source software you can use from Hermes Agent. It is not affiliated with or endorsed by Nous Research.
Add Kiln to Hermes →Using ChatGPT? →Using Claude? →Using Codex? →Using Cursor? →Using Gemini? →Using Grok? →Using OpenClaw? →
Kiln is independent, open-source software. It is not affiliated with or endorsed by Nous Research.