3D Brushless Motor

Based on this.

I would like to replace the 3d printed filament with a ferrite/epoxy core. I think it would be stronger both physically and magnetically. I'd like to print the bearings as well. Something like this, though it might make sense to use pre-made ball bearings. It may also be feasible to melt hdpe and use a ball bearing mold made of plaster to create accurate bearings.

It's not called out in the video, but it may make sense to

Terms

The windings is the armature. The windings are on the stator, the magnets on the rotor.

In Runner vs Out Runner

In runner has magnets on the inside. Trade off is in voltage vs torque (?).

Outrunner is harder to cool because coils are in the middle.