HELP creating geometric shape for 3D printer

[curious aardvark]

lol - geometry was never my strong suite.

so you've got a square base with 8 triangles vertically mirrored to another 8 triangles and a square top ?

Ah - do you perchance know the actual angles of those triangles ?
That would probably help.

Actually what I need is the width of the base of the trinagles and the height of the triangle from the centre line to the apex.
That'll give me a proportionally corrext sized triangle. Which I can then rotate and tilt to make the actual shape.
In theory anyway :-)