I enjoyed building and driving this fully 3D-printed RC car in the last couple of months. Even the gears are fully printed in PLA, and they work smoothly (if I keep the power on a decent level). I found this fantastic project called Tarmo on Reddit. This is currently version 4 and there is also a version 5 (rear transmission only). I was immediately impressed by the community around it. They have a ton of hacks and many people who are continuously helping each other.
The car itself has crazy torque. I had to limit the power to 25% to stop breaking the gears, and it still pushes like a horse. I made a couple of jumps, only breaking a few pieces. It takes only a couple of hours to be on the streets again.

Instructions and printables to build the car yourself: https://docs.google.com/document/d/1h...

Subreddit:   / engineeringns  

List of materials (with affiliate links):
Filament Prusament PLA Galaxy Black: https://amzn.to/3AfFYs8
Drive motor (brushless): https://amzn.to/3ruRxaI
20kg digital servo: https://amzn.to/3IscXwj
80A+ Brushless ESC: https://amzn.to/3rB2dop
80mm shock absorbers: https://amzn.to/3FJavzz
Rod ends for M3 screws: https://amzn.to/3GMGv7l
PTFE lube: https://amzn.to/3GOuwWS
Differential Gear set Traxxas 5382X: https://amzn.to/33R0D9J
Wheels with 12mm hex: https://amzn.to/3nJz75a
TPU Filament Ninjatek Cheetah: https://amzn.to/359nLB4
10x15x4mm Ball Bearings: https://amzn.to/3tHJPwQ
15x24x5mm Ball Bearings: https://amzn.to/33R16J1
M3 threaded rod: https://amzn.to/3qKX0uU
M4 threaded rod: https://amzn.to/3GRc0wU
Battery charger: https://amzn.to/3qKwvFY
Transmitter+receiver with gyro: https://amzn.to/33AHDfW

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Music:
You & I by Soyb & Amine Maxwell
  / soybmusic  
  / aminemaxwell  
Creative Commons — Attribution 3.0 Unported — CC BY 3.0
Free Download / Stream: http://bit.ly/l-you-and-i
Music promoted by Audio Library    • You & I – Soyb & Amine Maxwell (No Co...  

Malecon by Soyb & Amine Maxwell
  / soybmusic  
  / aminemaxwell  
Creative Commons — Attribution 3.0 Unported — CC BY 3.0
Free Download / Stream: https://bit.ly/al-malecon
Music promoted by Audio Library    • Malecon – Soyb & Amine Maxwell (No Co...  

Timestamps
0:00 Chassis and Differential boxes
2:30 Drive motor and Driveshafts
3:29 Locked and Open diff
4:37 Servo
4:54 Front transmission and suspension
6:12 Rear transmission and suspension
7:03 Steering system
8:25 Wheels
9:07 Wiring electronics
10:21 First tests
10:35 Reveal!