This is a simple but convenient SD card holder for 7x3 SD cards: - the holes for the cards are 10 mm deep - the gap between the cards are 12 mm to be comfortable with big handed guys - the SD card sockets are angled in 72° I also uploaded the Fusion 360 design file. If you want to customize just change the "rows" and "columns" numbers on the Parameters panel and let Fusion 360 to redesign the holder for you.