This model, which is split in two, adds an internal band to assist with gluing the halves together. A future adaptation might add a hole/plug for removing coins. With my nephs/neezs I want to make it difficult! I suggest printing with the split/hollow side facing the print bed to improve seam accuracy. I printed with PETG .35 speed using organic supports. Another solution is to use variable layers, but they don't work with organic supports.
The author remixed this model.
I remixed the original to split in half, make the interior completely hollow and add a coin slot.