Tetrahedron
thingiverse
A simple Tetrahedron (T, Td) a=b=c Construction starts by drawing the vertices of a triangle, not two parallel edges, or other points like in cubes and rectangles. Now connect the vertex to the 3 surrounding nodes, to create a triangular prism face. Then we must remove a square and another face of four more triangular prisms faces on top. Instructions: FreeCad Tutorial(not me!): youtube.com/watch?v=9jXRCJCJNv0 Basic concept: Use properties of cube construction to aid Tetrahedron creation.
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