A rear lower suspension arm I used for my 1/10th scale rc car. Copied the design of the existing arm on the otherside.
I used PLA 15% infill and printed it horizontally

Rear lower suspension arm for RC car

rear lower suspension arm.stl

A wheel rim (no tyre) I made that fits onto normal hobbyist rc cars, using some tyres I took off of a cheap broken kids toy rc car. 
The dimensions of the tyre are 80mm diameter, 35mm width. 
I printed this at around 15% infill using PLA, with supports ON. May require some light sanding

RC car wheel rim

wheel rim rc car v2.stl

I couldn't find any reasonable replacement center caps for my Moyu RS3M 2020, so I made one that fits reasonably well. I used PLA with 50% infill

Center Cap Replacement Part for Moyu RS3M 2020

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Rear lower suspension arm for RC car

RC car wheel rim

Center Cap Replacement Part for Moyu RS3M 2020