Here are some regular patterns to be used as infill and internal structure for 3d models using OpenSCAD.
Version 1: Cone tubes
This structure consist of separate tubes with double cones. The tubes are arranged rectangular.
Version 2: Sphere tubes
This structure consist of separate tubes with spheres. The tubes are arranged hexagonal. The calculation is time intensive.
Version 3: Octahedrons
My favorite structure consist of linked octahedrons. The octahedrons are arranged rectangular. The wall size is at minimum.
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