Model originally uploaded to Thingiverse at https://www.thingiverse.com/thing:3999092.
This is yet another playing card box. It's a simple model, but quite functional. In addition to providing a nice place to store cards, the base makes a great draw pile holder, and the top makes a great discard pile holder.
The spade-shaped hole at the top helps to prevent cards from sticking to the lid due to air pressure, makes a nice finger-hold for pushing cards out, and it's nice to see at a glance which set of cards are inside the box.
This one is sized perfectly for the Bicycle brand of 52 cards (with room to spare for jokers, etc.). The inside dimensions of this box are 64mm x 88.3mm x 20mm (plus an additional 0.3mm tolerance around the width and length). The Fusion 360 file is here in case you need different dimensions for your brand of playing cards. The construction is parametric, just update the variables for Width, Length, Height, Tolerance, and Radius to suit your needs.