Trocta Beam - Truncated Octahedron Beam
Description
Truncated octahedron support beam, inspired by the [Z-Beam](https://reprapltd.com/3d-printed-beam-that-is-as-stiff-as-steel/) by RepRap Ltd. The truncated octahedron is a near-optimal space-filling tessellating structure. Additional vertical struts have been added at edge centres to reduce bending, but still keep within the confines of the beam. I have also added ridges to most of the internal faces so that bridging is easier.
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