Hi, this Stand is designed to hold toploaders, I use the one from Ultimate Guard. Please contact me if you need another size e.g. for Baseball Cards.
It has a 5° tilt to the back and is held by a small lip at the bottom front and the sides to keep it from falling backwards.
My printsettings are:
4 top-, bottomlayers and walls
10% infill
but it doesn't really matter, make them as solid as you like (obviously a little bit of weight in the bottom helps with accidential knock-overs from wind or stumbling against the cabinet) . And there is no support needed.
If you need a stand for Magnetic Card Cases:
https://www.printables.com/model/888063-magnetic-card-case-stand
The author marked this model as their own original creation.