the star cut
thingiverse
This model was created using Tinkercad. Edit it online at https://www.tinkercad.com/things/fUJuNLSlnFk Instructions: To make this, combine flattened cylinders in a star pattern and spin them into a complete circle. Examine the design on tinkercad to see how this is done. Next, cut away most of it with a large square that has been turned to have a hole.
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