Belt transmission with 688 2RS bearings for truck v3

thingiverse

WARNING: transmission length may vary significantly from the original, adding approximately 10mm to its overall size. If you have a truck bed, be prepared to make modifications to accommodate the transmission. Choosing four 688 2RS bearings and 8mm shafts has simplified the assembly process. The reduced number of spacers now spans only two gaps instead of four, no longer requiring bridging the 8mm shaft to the old 10mm bearing gap. Assembling the components is now significantly easier. When selecting belts for this project, consider experimenting with 110 or 112 tooth options, depending on print accuracy. Keep in mind that overly tight belts can lead to excessive current draw and potential overheating of the motor. UPDATE: I've added a closed bearing holder and a modified mid-shaft bearing orifice design. Additionally, I've provided drawings for both shafts to aid with assembly. To complete this project, you will need: - Two 110-tooth 2GT belts - Two 112-tooth 2GT belts - Two 20-tooth 2GT pulleys with an 8mm bore and 6mm width - Two 40-tooth 2GT pulleys with an 8mm bore and 6mm width - Two 8mm metal shafts - Four 688 bearings UPDATE: I've included a *.stl file for the shafts as a reference point. To improve durability, consider using metal shafts or filing down plastic ones to fit the u-joints from MrCrankyface's original design.