You can save hundreds of dollars by replacing the pads and rotors yourself. And it only requires a few cheap tools.

[Tom Stanton] wanted to see if supercaps have any practical use on e-bikes, and built a DIY ... flux motor for the bike, using 3D printed formers for the coils and an aluminum rotor with embedded ...

From experimenting with different rotor and commutator designs to ramping up the voltage, we’ll see just how much power these DIY motors can take. Can we reach 120 volts before they overheat or ...

Looking to demonstrate the capabilities of one of these rebuilt alternators, [DIY King ... machine a new rotor and fill it with the neodymium magnets salvaged from hoverboard motors.