Formlabs' web app for adding printable surface textures to a model: upload an STL, choose a texture, adjust scale, depth and sharpness, then download a textured file to print. Textures look best on resin (SLA) printers; FDM works with coarser textures.
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Model Spiralizer
cnckitchen.github.io
Free browser tool from CNC Kitchen that coils a long, strip-shaped STL into a flat spiral and exports a new STL, handy for fitting long parts on a small build plate. You set the inner radius, pitch and winding direction…
Onshape
onshape.com
Professional parametric CAD that runs entirely in a web browser, with mobile apps for viewing and editing on the go. Files live in the cloud, so there's nothing to install and real-time collaboration is built in. The fr…