OBSOLETE: Truck v3 belt gearbox

thingiverse

OBsolete: New Design Uses 688 Bearings: https://www.thingiverse.com/thing:4109315 Warning: I Tested the Transmission Today and Found Out Belts Need to Be Tighter, They Are Skipping. I Investigated and Figured Out One of the Belts Was Skipping Because I Had a Bad Print Which Caused the Centers of the Two 8mm Shafts to Come Closer. I Replaced the Original 112 Tooth Belt with a 110 Tooth Belt and the Issue Is Gone. I Left the Motor Belt at 112 Teeth. Be Aware That Too Tight Belts Will Cause the Motor to Draw Very High Currents, in My Case It Was in the High 22A if I Switched Both Belts to 110 Tooth Versions. Keeping the Motor Belt at 112 Teeth and the Output Belt at 110 Teeth Solved the Issue for Me. In Essence, This Is a Design with No Tensioners, So Order Both 110 and 112 Tooth Belts and Experiment What Works for You. Be Sure to Measure the Operating Motor Current, Otherwise You Risk Frying the Motor. Good News Is That the Transmission Is a Lot Quieter Now. This Is Not a Project for the Fearless. It's a Nightmare to Print and Assemble. Yet It Provides Quieter Operation Than the Geared Gearbox. The Gearbox Is Approximately 1 cm Longer Than the Original Design, So If You Have a Bed on Your Truck, You Will Need to Modify It. Hardware: - 2x 110 Tooth 2GT Belt - 2x 112 Tooth 2GT Belt - 2x 20 Tooth 2GT Pulley with an 8mm Bore and a 6mm Width - 2x 40 Tooth 2GT Pulley with an 8mm Bore and a 6mm Width - 2x 8mm Metal Shaft - 4x 6700 Bearings Edit: Added *.stl for Shafts for Reference, Added a Square Interface Output Shaft That Can Use U-Joints from MrCrankyface's Original Design. But If Possible, Just File Down Some Metal Shafts, as I Am Not Sure How Durable Plastic Ones Are.