It's my son's second Christmas, so now that he is starting to get excited about the whole experience, we decided to make him an advent calendar. We bought a series of bags on a string that we can later re-use to hang some photos, and want to fill the bags with alternating toys and treats. The toys will be 3D-printed, and I'm basically just selecting popular designs from the Toys category on Thingiverse.

Yesterday he got Flexi Rex and tomorrow, if the print goes well, he'll get a bathtub boat.

Flexi Rex