r/3D_Printed_RC

I’ve been designing and building a large scale RC car for the last while. The idea was to be a 1:4 scale Ford GT40, but bodywork is a long ways off.

The wheels aren’t aligned as the car is powered down, and the servos don’t hold position like this.

Anyway - four wheel steering, four wheel drive. CV joints for all power transmission points, mechanical plate torque limiting clutches, and running 1:1 gearing from the 270kv motors electric longboard motors. Running 4 4S lipo packs in series/parallel, so it’s 8S voltage and decent running times. I’m not printing _everything_, just everything I can. I did make the wheels - printed the wheel and cast urethane to them. Probably a bad choice, as they are the second heaviest part of the car at ~11 lbs total. (Yes, the motors are heavier!)

Recently switched to ESCape32 based ESC’s, which have been great. Planning on intercepting transmitter controls at some point with a Rpi5 and some rp2040s so I can do proportional steering based on speed, etc.

The reason I’m doing the combined battery packs is to have the voltage the same for each motor. Probably going to redesign this once I have the design finalized (ha!) with proper bus bars and a 21700 DIY pack. The motors support up to 48v, so I’m probably going to try to hit that at some point.

If folks want, all my design is in onshape, but I’ll warn the docs are a bit of a mess. When I get to my final (ha!) design, I’ll clean it all up. I am using sendcutsend for metal reinforcements for the parts that can’t handle the torque of the motors.

r/3D_Printed_RC

gt10/rc