This “Large Helical Heart” has a secret compartment inside! The pieces twist apart into two separate but identical pieces.

Print in different colours to highlight the spiral curves.

See here for video: https://youtu.be/SSzDglASqT4

Two “Helical Hearts” available: Large (plain and with hidden compartment): https://social.thangs.com/m/690383 Small: https://social.thangs.com/m/690164

The “Large Helical Heart” is 80mm at the widest point, the “Small Helical Heart” is 50mm at the widest point.

Print two copies of the file. In order to preserve a smooth sliding contact surface, print the files on the side as they are oriented. Try raising the model off the bed by 3mm or so and building tree support up to the overhangs.