Thingiverse
Trisection of a cube
by Thingiverse
Three equal parts form a cube. The fit is perfect, assembly can be challenging. I have reverse engineered the "Cubic Trisection", invented by Robert Reid and designed by Oskar van Deventer.

Update: Added a version with a 0.4 mm gap between the assembled parts to make up for printer inaccuracies.
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