File: Shaft Couplings Reducers.STLName: Shaft Coupling - Metric - ReducersMaterial: 27 grams ( 0.06 lbs) Infill = 12%Size: 72.56 mm (2.857") x 75.56 mm (2.857") x 30 mm (1.181")Resolution: 0.20mmLayers: 156 layers Rafts: Yes Supports: NoPrint Time: 3 hr 29 minFunction: Prints a set of six couplings to connect 3mm, 4mm, 5mm, and 6mm shafts together in any combination required. Each couple requires two M3 x 12 screws and M3 nuts to squeeze each end of the coupling to its shaft. If you don't need all six, simply print the size you need. These couplings will take a surprising amount of axial misalignment inclduing offset and angular. Each end of the coupling has the size engraved into the surface.