This downloadable 3D-printed mod 1.5 spur and pinion gear set (as opposed to 0.8) is designed for the ARRMA Typhon 3S. I designed these because I kept blowing spur gears on mine so I wanted a cheap and durable replacement (even if it is printed due to the large tooth size compared to stock means these are plenty durable). I printed mine out of petg at 100% infill however I would suggest using pa6 or pa12 natural. DO NOT USE PLA it will melt and make sure to be careful when pressing the pinion gear onto the motor shaft as it is a tight fit.