I printed the tower for my brother and he wasn't super keen on having it without a ring to keep the dice in check. He also loves dobby so I made a ring, embedded a dobby and cut out a hole for the front of the bank to poke through.

The site won't let me reference 2 sources for some reason so the dobby I used came from here:
https://www.thingiverse.com/thing:4084230 To make sure they get credit you need to download their files and print a head and both arms