A simple playing card holder I made for my daughter.

Fusion360 file and short how to change the name in the pictures 💪🏻

Update

Since the top layer is not flat it always printed with small "stairs"
To get rid of this I rotated the X axis in PrusaSlicer 10° upwards and activated supports

This got me a nice top layer, but the bottom was not very even…
My first idea was to use an ironing iron to make it nicer, but since I still had an unopened roll of TPU filament I decided to print an additional layer (thanks to the comment of EGBrader!) to glue on the bottom (2 different .stls are only the diameter of the circles, 12 mm is a very tight fit, I used 11 mm and more glue ^^)
For this I also created small holes in the bottom

Print instructions

I printed it with no supports and 15% infill in Prusament PETG or PLA

The TPU I used was no-name and in PrusaSlicer I selected "Generic FLEX"