Gridfinity Memory Stick Micro (M2) card holder

Couldn’t find a ready‑made model to store a larger number of Memory Stick Micro (M2) cards, and needed a way to organize a bunch of old Sony M2 cards, so this custom insert was created. This Gridfinity insert holds up to 24 M2 cards in a compact, easy‑to‑access layout. M2 cards are slightly larger than microSD cards, so each slot is sized specifically for the M2 format to keep the cards secure while still easy to remove.