Nikko 1/20 Spur gear 29t (1982)

thingiverse

I have both the Porsche 935 and VW Scirocco made by Nikko in scale 1/20. Both suffered from cracked gears, so I created replacement parts and printed them in PLA. The original gear had a different design with supports on each side, but that would increase the chance of failure significantly. Instead, I removed one support and replaced it with a solid disc to strengthen the gear. To compensate for the missing support, I increased the length of the other support slightly. Both cars are now running with the printed gears, working flawlessly. However, I'm unsure about the durability of PLA in this application, as I have no idea how quickly it will wear down. Nevertheless, the sound when driving doesn't indicate any tightness or looseness in the gear, sounding remarkably similar to the original gear on a brand-new car. Printer Settings: Printer: Creality CR-10 Rafts: No Supports: No Resolution: 0.2mm Infill: 100% Notes: Make sure your bed is perfectly level; otherwise, the gear will become skewed and won't function properly. Post-Printing: Fitting the Gear to the Axle You may need to grind the center hole slightly for a secure fit on the axle. Be cautious not to make it too tight, as the gear might break, or too loose, causing the gear to slip. I used a Dremel to achieve this and found it to be a quick and easy task.