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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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…
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…
Shapr3D
shapr.com
Professional CAD designed around touch and Apple Pencil, with full versions for Windows and Mac. It's one of the most approachable precise-modeling tools: sketch, push and pull, then export STEP or STL. A free plan allo…