Here is an object made especially for my son. He is 3 years old and he knows how to use this piggy bank on his own: put the coins in, open, remove the coins, close.
The assembly is very simple but you can watch the tutorial here:
3D printing settings
The can and the container are printed in 0.28mm. Printing time: 10h
The parts of the handle are in 0.2mm. Printing time: 1h30.
All parts are to be printed once, except handle2.stl to be printed twice.
Handle1.stl contains its own supports, so printing is done without support.
Credits:
LabLabStudio