Building and Testing a 3D Printed Brushless Motor (until it explodes!)
YouTuber Christoph Laimer has built this very powerful, 3D-printed brushless DC electric motor. It has 600 Watts, and performs with more than 80% efficiency.
The main components, such as the rotor and stator can be printed with a common FDM-printer. All magnets, copper wire, and ball-bearings used are ordinary components.
The magnets of the rotor are arranged as Halbach Array and the motor runs with a standard ESC widely used in different RC-applications (plane, drone, car etc).
Update, Tuning and Testing
Step-by-Step Instructions: https://www.instructables.com/id/600-Watt-3d-printed-Halbach-Array-Brushless-DC-Ele/
Testing the original design (to explosion)
Christoph's original 3D printed brushless motor design can be found at http://www.makesea.com/brushless-motor.
In the below video he tested the maximum rotation speed, with the eventual destruction of the motor intended, to discover the safe operating range.