The fischertechnik construction toy system has angular blocks with 7,5°, 15°, 30° and 60°. This is the missing 45° angular block. Connecting eight of them in a circular arrangement will result in a outer diameter of 37,5 mm and inner diameter of 7,5 mm.
Inspired by an idea from this thread in the fischertechnik community.
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No supports are needed if printed as provided.