The file 'Lid For Catan Stackable Card Holder ( Small Cards ) 3D Printer Model' is (stl) file type, size is 39.0KB.
This is a lid for the"Euro plastic catan intersecting card holder with thumb indent" by thingiverse user thedbp
https://www.thingiverse.com/thing:2591191
It covers the upper cards while stacked.