From part description to
precise 3D model & STEP export.
Mechanical engineers and hardware developers use Prompt2CAD to rapidly prototype functional parts. Describe a bracket, an electronics enclosure, or a multi-part assembly — get a parametric 3D model in seconds. Iterate on dimensions through conversation, verify with screenshots, and export to STEP or STL — all in one browser tab.
120 free credits · 1 design with several iterations included
Your prototyping workflow is too slow
You have a mechanical concept in your head — a bracket that needs to nest, an enclosure with a specific clearance, a mounting plate with precise hole positions. To get it into CAD, you open Fusion 360 or SolidWorks, define sketches, extrude features, add fillets. Hours later you have a rough version. Then you iterate. More hours. Each dimension change means re-defining constraints. By version 50 you've spent a week converging on a geometry you could describe in one sentence.
Prompt2CAD collapses this: describe → 3D model → iterate by conversation → STEP export. The geometry converges at the speed of thought — each iteration is one sentence, not a series of feature-tree edits. In early testing, an engineer converged on a 215-iteration telescoping bracket design entirely through conversation, making sub-millimetre adjustments with each message.
From description to precise 3D part in 4 steps
Describe the part
Type a natural language description: "a telescoping bracket, 200mm long, with an inner and outer track and a locking pin." The AI asks clarifying questions about dimensions, materials, and clearances.
Iterate on the geometry
The AI generates a parametric 3D model and verifies it from multiple camera angles. Say "raise the inner track by 0.3mm" or "add a countersunk screw hole on the left face" and the model updates instantly.
Verify with screenshots
The AI takes viewport screenshots from the front, top, and perspective angles. If a clearance looks wrong or a flange doesn't meet, it reads the geometry code and corrects itself.
Export & prototype
Export to STEP for further refinement in Fusion 360, SolidWorks, or FreeCAD. Export to STL for 3D printing a prototype directly. All dimensions in real-world millimetres.
Why mechanical engineers and hardware developers use Prompt2CAD
Describe mechanical relationships in plain language
"The inner piece nests inside the outer piece with a 0.5mm clearance." "The flange folds over the lip to prevent lift-out." Explain how parts fit together the way you'd describe it to a colleague — the AI builds the geometry to match.
Sub-millimetre iteration through conversation
"Raise the inner track by 1.2mm." "Widen the slot to 4.2mm." "Make the flange 0.3mm thicker." Each change renders instantly. Converge on exact dimensions through conversation instead of clicking through feature trees.
Parametric controls on every dimension
Wall thickness, hole diameter, slot width, clearance gaps — every critical dimension becomes a slider. Drag to explore tolerance variations instantly without re-describing the part.
Self-verifying AI
The AI takes screenshots of its own work from multiple angles and checks for correctness. If a flange doesn't align or a clearance looks wrong, it reads the code, diagnoses the issue, and fixes it.
Export to STEP for your CAD workflow
Export to STEP for Fusion 360, SolidWorks, or FreeCAD with millimeter-accurate dimensions. Or export STL for direct 3D printing of prototypes. All dimensions in real-world units — no scaling or conversion needed.
Multi-part assemblies from description
Describe a two-part bracket, a snap-fit enclosure with a lid, or a clamp assembly with a hinge pin and cam lever. The AI handles part positioning and clearances so you get a co-located assembly from the start.
Part types you can design
Strongest with rectilinear and prismatic parts — brackets, enclosures, plates, and assemblies with precise dimensions.
Start prototyping parts today
Free trial credits — no credit card required. Describe your first part and get a parametric 3D model in seconds.
Start Designing →