Summary This is a holder for SD cards. It has 2 slots for microSD cards and 2 slots for full-sized SD cards or adaptors. The back of the model has a hole for a 5mm screw. I designed this to screw to the top of the command unit for my printer. Print Settings Printer: Monoprice Maker Select (Prusa i3) Rafts: No Supports: No Resolution: 0.2mm Infill: 20%