Model originally uploaded to Thingiverse at https://www.thingiverse.com/thing:4349764.

This is an additional cap to my original, except this one is thicker and has a hole in the bottom to accept the top of a cap. Take a look at the photo's. The bottom is chamfered so you know which way up it needs to be.

The fit is nice and snug, so they feel firm and secure.

This is just really good for transporting small numbers of figurines, or keeping paired figurines together.