Bondtech drivegear kit These drivegear kits come as a set consisting of a primary drive gear, a secondary drive gear, bearings and a shaft. Gear set for filament size 1.75 mm, primary gear with inner diameter 5 mm, secondary gear with two needle bearings,M3x2 setscrew and one 3 x 20 mm shaft. A Lithium based grease is recommended to use on the gear section and inside the needle bearings for low friction and to avoid wear. A small dab of grease is enough.