I'm always forgetting what floor I parked my car in, so I made a holder for the parking access card that incorporates a movable tab with which I can mark the floor it's in. The tab is relatively hard to move, so it won't move around on it's own.
I printed the tiles in different colors to match the different colors of each floor, the first two layers in color and the rest in black so the number is visible. You have to print the tiles and the marker first, and then print the holder. For the holder, insert a pause at layer 2.6 (if printing at 0.2) to be able to insert the tiles (glue them in place) and the marker (do not glue, obviously). Then continue the print and hopefully the marker will be able to move freely without falling out. Note that the marker is taller than it is wider (by about 0.3mm), make sure the wide side is positioned correctly or the marker will be too tight and won't be able to move. The orientation of the STLs should work.
The holder needs to be printed with supports so the three tabs print well. Be careful with the supports, they're kind of hard to remove afterwards. I use PrusaSlicer and created support enforcers at the edges of the tabs so the supports would be separated from the side walls and a bit easier to remove.
The author hasn't provided the model origin yet.