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. One of CNC Kitchen's free web apps, alongside BumpMesh.
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Formware Online STL Repair
formware.co
Free online tool that automatically repairs broken STL files (holes, flipped normals, non-manifold edges) so they slice cleanly. Upload, repair, download; nothing to install. It comes from Formware, a developer of slici…
Meshmixer
apps.autodesk.com
Autodesk's free tool for editing and repairing STL meshes: sculpting, hollowing, cutting, combining models and generating tree supports. Autodesk stopped developing Meshmixer around 2021 and folded some of its features…
BumpMesh
bumpmesh.com
Free browser tool that adds real, printable surface textures to a model: wood grain, knurling, leather or your own image. It accepts STL, OBJ, 3MF and STEP and exports a displaced mesh, so the texture prints on any prin…