I got tired of not being able to see the tops of my Dremel Collets in the little bit storage container they give you. So I took some measurements and learned how to do some simple stuff in Fusion 360. Also included a Collet and Nut holder...in case you have spares.
Dimensions of the container this is going in are 30.5mm x 30.5mm x 20mm.
Nothing special, just print.