This is a somewhat customizable advent calendar. It is customizable in that you can 1) put a name on it (using the supplied FreeCAD models), 2) print your own color box, and/or 3) make a custom topper.
In terms of printing: I place it on its large flat face diagonally on the bed (see the image with the model on the build plate) and I printed without build plate adhesion so I could make the advent calendar larger. The drawers could be further updated to put numbers on them, I just let my kids take random drawers. I believe I had to scale my drawers to 98.5% because of the tolerances, that makes the usable volume 54.8 x 23.3 x 34.7 mm. The topper provided is just a star, but you may customize with any base of 15x10 mm (at least 20 mm high) topper you want. I used a 14.2x9.5 mm base because of my printer tolerances/slicer settings. None of the models require supports. Print time and the amount of filament used is highly dependent on your settings; with my settings, the tree came out to be 350 g and took a little over 36 hours.
The author hasn't provided the model origin yet.