Every 3D printer needs a "slicer": the program that turns a 3D model into machine instructions. All of them are desktop installs, and the web ones upload your files to a server. So I spent months porting the engine to WebAssembly. It runs entirely in your tab: Arachne walls, tree supports, multi-material with a prime tower, and resin printing with PrusaSlicer's support/pad chain exporting .sl1. Open the page and it slices a Benchy in front of you; no signup, nothing leaves your machine. Open your devtools network tab and check. It's also an npm package, because the part I actually care about is that print preview and quoting can now live inside someone else's web app instead of requiring a download. It's derived from OrcaSlicer, so it's AGPL-3.0 and fully open source.

Three Slicer

Slice 3D Models to Gcode in browsers. No install, no upload.

Slice 3D Models to Gcode in browsers. No install, no upload.