A simple snap-in plug for a 32mm hole in the bottom of a Piggybank. The scad-script is made for a material thickness of around 4mm and with a bit of tolerance to allow for a layer of varnish or paint.
Play around with the tolerances in the script for a good, tight fit, vs. ease to remove the plug.
I have printed loads of these in PLA. and most of mine are so flexible that the pins won't break when removing and inserting the plug, but do test it out, as I have experienced that at least one of the PLAs I had turned very brittle after printing.