Summary

A simple dice tower with a tray to collect the falling dice while open or store them while closed.

The tray is not locked and it is sized to slide in and out quite freely, you can print it 2-3 tenth of millimiters taller if you want more friction and trust your printer's accuracy

The tray need supports for the knob, for the tower set the incline threshold at 60° and they should print only where needed (and not inside the tray hole where removal would be hell)