This is a Shifter "gear" for the 1/10 scale Traxxas Summit. it is designed to eliminate the huge amount of slope in the original drivetrain. It should be a direct fit, but depending on your 3d printer it might need some filing.

Here are my settings:

extrusion multiplier: 0.9

layer 0.25mm

infill 100%

speed 40mm/s

supports: yes

With these settings there were only a small amount of afterwork needed. 100% infill is recommended for maximum strenght since it is a drivetrain part.

With this thing in my gearbox the summit has a play on rollout about 5 cm total! with stock part it was more than a half meter(50cm).