Summary

This model was inspired by the origami model Umulius Rectangulum by Thoki Yenn. It is a simple rectangular version of Borromean rings, which are rings that cannot come apart even though no single ring is linked through any other.

Simply print two intact links and one pair of links with joints. The joining link should be printed with the joints facing up so you won't need supports. That also causes the print lines to circle the joints, which adds friction and helps the model stay together.