In Russia, scratch markers are now popular, which are sold in 40-80 pieces in a soft bag. After you take them out once, you can't put them back, it's not convenient to use. Here's my version of the marker box. The thickness of the marker is no more than 15mm to get into the cell. Note that infil density must be more than 30%. And after print it need to be glue

Thin desing for 40 pc (5*8).

And I used Bart simpson idea, thainks for Joew1120 (https://www.thingiverse.com/thing:4977851)