As mentioned above this is a remix of the very nice SD card box from Planeta13: https://www.printables.com/de/model/167045-sd-card-box
I use the original box at the printer for my “empty” SD cards and the here presented remix with two card slots to mount on a table for the “To Do” SD cards (with g-codes I'm planing to print).
It prints easily without anything special on my MK3s using standard PLA and I used double-sided tape to fix it on the table. I'll likely re-print it in the Prusament-Orange but the spool is empty …
Enjoy!
The author remixed this model.