I made a version of this money box for my granddaughter with her name on the front of it. This version is a generic version of if that has some basic shapes etched into the sides.
I used Cura to slice it as it seemed to provide the best results as both parts require support material. If you use the grid pattern and "touching bed" only support it will print a column in the middle of the money box that will be able to be removed through the bottom hole without too much effort.
The base is designed to slot into the box and turn to secure it to the money box, and is used as a small base for the money box to stand on.
20% worked for me just fine
Noes as per the description re support and slicing settings.