Commonly available tank gearboxes generally operate too fast for scale speed. They can also be noisy, not deliver enough torque, and some models are not compact enough to fit in smaller or oddly shaped tanks.

What is needed is a high torque / low rpm capable gearbox that is quiet, low profile, lightweight, and affordable. Perhaps with some manner of changing gear ratio for different uses.

Given the scratch-building expertise here on the forum, and the proliferation of 3d printers, desktop cnc machines, robotics and hobby electronics parts availability... collectively we should be able to solve this.

Who wants to collaborate to design a better gearbox?

Is it possible to create a design that people can build at home from sourced parts, rather than requiring a traditional manufacturer?