All the credits for this great model goes to Reno77. This is a remix from https://www.thingiverse.com/thing:2502026
If you just want the model or the cup, look there.
The Piggybank is a little bigger (150 mm), hollowed (wall 2.4 mm), coin-slot (35x3.5) and a threaded opening (https://www.thingiverse.com/thing:3383689) at the bottom are added.
Supports at the outside are needed. The roof is already supported with a dome inside.
Happy Saving.