3 piece puzzle

thingiverse

This is a cube sectioned into 3 identical spiral pieces, each offset by 1mm for extra wiggle room. Scaling down is not recommended since built-in tolerances decrease accordingly. To achieve smooth results, print with thicker walls and plan on some sanding. You'll need to print this design three times to get all the necessary pieces. Since I haven't actually printed it out yet, your mileage may vary.