Drop a .step CAD assembly — a real OpenCascade kernel meshes it in your browser via WebAssembly.
100% local · file never leaves your browser
STEP (ISO 10303) is the parametric CAD interchange format — used by Fusion 360, SolidWorks, Onshape, FreeCAD. It carries true B-Rep geometry: surfaces, edges, assemblies.
STL is a mesh of triangles. We tessellate the B-Rep with the OpenCascade kernel (~7 MB WASM, loaded once) at a printer-friendly tolerance. The first conversion takes a beat as the kernel boots; subsequent ones are instant.
The file is parsed in WebAssembly + WebGL on your device. Nothing leaves.
No queue, no upload. Most files convert in well under a second.
Orbit, pan and zoom the result in real time before you commit.
OpenCascade WASM is ~7 MB. It's cached after the first download — subsequent conversions are fast.
All parts are tessellated and welded into a single STL. Use your slicer if you need per-part placement.
Default tolerance is tuned for FDM printing (~0.1 mm chord error). Curves look smooth at typical print scales.