3FTech M-Lok Slot Covers: FFFTech/FFFTechnology I really don't know why people like these, it's not like the M-Lok slots get in the way of anything. Oh well. They're covers. They attach via two M5 screws and t nuts. Four variants are available: * Single Slot Cover * 1.5 Slot Cover * 2 Slot Cover * 3 Slot Cover Printer Used: Monoprice Maker Select Plus Filament Used: PLA+ Print Settings: Extruder: 210C Bed: 56C First Layer Print Height: .20mm Standard Layer Height: .14mm Wall Thickness: .40mm Wall Perimeters: 4 -5 Infill: 25% Infill Pattern: Gyroid Material Flow: 100% Support Material Percentage: 30% Hardware Needed: 2x M5x10 Hex Socketed Machine Screw/Bolt 2x M-Lok T-Nuts (Be sure both bolt & nut are the same thread pitch.)