This is one of my personal favorites. The earring consists of 3 cube outlines, that are interlocked. After printing it and removing the support material, the cubes will move freely. I would love to hear your feedback.

This was designed on Tinkercad and printed using the MakerBot Replicator 2. I printed it in high def, used a raft, and enabled supports. The supports have to be removed carefully because some of them are inside the cubes.