stl-er

What is stl-er?

stl-er is a text-to-3D tool for functional parts. Instead of generating a mesh, its AI writes CAD code from your prompt, so the result is clean geometry with parameter sliders for dimensions, wall thickness and hole sizes. You can also describe changes in words to refine a model, and advanced settings cover things like gear modules and pressure angles.

According to its own roadmap, it works best on simple to medium parts such as brackets, enclosures, organizers and household items, and it handles text and engravings well. The engine runs on Google's Gemini models. A reader reports that generation has moved to Gemini 4 Argon, with better prompt following and cleaner geometry; the stl-er news page still names Gemini 3.7 Flash, from August 2026. Every model you generate goes into a public community library, which you can also browse and customize, so don't use it for confidential designs.

It runs in the browser and as an iOS and Android app, and you sign in with Google or Apple. The free plan gives 5 STL downloads a month and unlimited slider changes. Premium costs $5.99 a month for 100 AI generations, and Pro $15.99 a month for 500. Export is STL only for now; OBJ, 3MF and DXF are on the roadmap. It is built by one developer in Switzerland.

What you can make

• Brackets and mounts
• Enclosures and organizers
• Gears and mechanical parts
• Name plates and engraved parts

How to use stl-er

1. Open the web app or the phone app and sign in with Google or Apple
2. Describe the part, with dimensions
3. Adjust the sliders or describe changes
4. Export the STL and slice it