OpenRC 3D “Truggy” printable 1:10 RC car!
And probably trivial once released to be a printable whateverscaleyouwant car.
@ThantiK for 1/n scale, we’d need a parametric and scripted model - gear modules, bearing sizes, rods, screws, motors, batteries all don’t come in arbitrary sizes, so it’s going to be a bit mote complicated than simply scaling the model up or down 
I like 1/10th, though - it’s a nice scale that’s both easy to lug around and is fun to drive on may different terrains.