Exploding Kittens Party Pack insert for sleeved cards. Works with the Polish edition, not sure if it fits others.
Designed to print without supports on Bambu Lab X1C, though might be a bit of a stress test for your printer if cooling is not dialed in right, since the lattice contains 60 degree overhangs. The latch uses a 45 degree overhang, so that part should be fairly accurate on most printers.
The example on the images is printed in PLA and it works fine, but printing in PET-G might be a good idea to prolong the life of the latch.
Attached STLs for the following print setup:
The model is parametric, so you're welcome to adjust it to your needs: https://cad.onshape.com/documents/3b6b5bba5d4dca30a370f950/w/613ff59857bdc402754631ac/e/bc2e0cfe856867685f71bd22?renderMode=0&uiState=676e98d2d6c8754a2872a0a5
The author marked this model as their own original creation.