Instructions: How to make a hollow, wooden tetrahedron — Steemit
A joined truncated tetrahedron - then cut in half : r/GeometryIsNeat
How to cut the miters for a tetrahedron, using a sliding miter saw? - FineWoodworking
Instructions: How to make a hollow, wooden tetrahedron — Steemit
Toolerable: Tetrahedron Success #2! (Part IV)
For all those wanting to make wooden D4 dice or just tetrahedrons in general, 3 cuts at 19.5 from the vertical will cut them out of a board. There's also 3 tetrahedrons
BUILDING TETRAHEDRON & HOW TO CUT EQUILATERAL TRIANGLE - YouTube