130mm 'in-wheel' NEMA 17 planetary adapter

thingiverse

This 6:1 NEMA 17 gearbox is designed for 130/135mm RC tires, just like the one from HobbyKing at https://hobbyking.com/en_us/1-10-2-2-big-foot-monster-truck-rock-2pcs-set.html. It's made to fit snugly inside the rim instead of using M12 bolts, making it suitable for most 125mm to 135mm monster truck sets. The idea behind this gearbox is inspired by Le Tourneau's electric wheel at https://edhird.files.wordpress.com/2010/08/rg-letourneau-electric-wheel.jpg. Special thanks go to Gear_Down_For_What on Thingiverse for his great work and explanations, but I wanted a simpler design with minimal external parts and post-processing. The NEMA 17 motor used in this gearbox is quite powerful since the gearbox itself isn't very efficient. I'm using a 17HS19 2004S1/59Ncm motor driven by a TMC2208, which provides quiet operation. To assemble the gearbox, you'll need three M3x10 screws for the base to stepper connection and three M3x22 screws for the cover. You'll also require three 22mm pins (I used cut nails) for the planets axis.