Unfolding STL models to make laser cut patterns
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.gitignore
Bunny-LowPoly.stl
LICENSE.txt
Makefile
README.md
camera.c
camera.h
corners.c
dodecahedron-corner.scad
dodecahedron.scad
faces.c
hiddenwire.c
icosahedron-corners.scad
mobius-maker
mobius-raw.stl
seg.h
stl-convert
stl_3d.c
stl_3d.h
svg.h
test.c
test1.scad
test1.stl
test2.scad
test2.stl
test3.scad
test3.stl
tetrahedron.scad
tri.c
tri.h
unfold.c
v3.h
wireframe.c

README.md

Unfolded sphere

unfold reads a binary STL file on standard input and generates a SVG that contains the triangles "folded flat" so that they can be laser cut. It will output multiple groups in the SVG file that will need to be re-arranged to fit on the laser cutter bed.

More info: https://trmm.net/Unfolding_STL

This is a work in progress -- it is not yet feature complete. Current features:

  • Collision detection works to build a non-overlapping set of triangles.

  • Coplanar triangles will be merged if possible.

  • Mountain/valley folds are marked. Dashed line means valley fold.

  • Starting face can be selected or randomly chosen; some produce better results than others.

  • stl-convert script can convert OpenSCAD ASCII STL files into binary STL files for unfold to process.

Among the features that it could use:

  • A better heuristic for finding the maximum non-overlaping set of triangles (Currently breadth-first search is used, with a slight preference for coplanar triangles)

  • Tabs for securing parts together.

  • Collapsing of very small or very thin triangles.

Wireframed dodecahedron

wireframe reads a binary STL file on standard input and generates an OpenSCAD file that has each vertex replaced with a 3D printable connector to create a large-scale version of the object.

More info: https://trmm.net/Wireframe

This is very beta! It desperately needs some command line options and some smarts in labeling the connectors, especially if the structure is not regular. Also, it does not detect intersections between beams or if the nodes are too close together.