This is a 4-Speed transmission modeled in under eight hours using SpaceClaim. There are a total of 50 parts.
The purpose of transmission in a car is to convert the torque created by the engine into a larger amount of torque through gear ratios.
This means that in a low gear, the engine spins faster, but there is a higher resultant force on the tires, meaning the vehicle is able to climb steep hills, accelerate faster, etc.
In a high gear, the vehicle will move faster, but will have more trouble accelerating, especially on an incline.
See instructions for details. Estimated time to completion: 1-2 weeks.
This project will require a great deal of time, as well as multiple spools of filament.