I just wanted less stuff taking up space on my workbench so I made this holder for that stuff specifically. It seems potentially useful to others and I'm pleased and a little proud of the result, so trying publishing here.
Taking advantage of the AMS, color changes are by layer only to minimize purge. The color pallet and changes can of course be customized to your taste.
This was a very basic Tinkercad exercise. Design-wise I deliberately used consistent, modular look and dimensions that would be easy to replicate if I (and now you) choose to expand it. If you find it inspiring I'd enjoy seeing where you take the idea.
Enjoy!