Homemade BLDC High-Torque Actuator
A high-torque brushless actuator I build almost entirely on my printer — hand-wound stator, printed structure, integrated bearing.
I wanted a joint that could actually hold weight without a gearbox the size of the joint itself. So I built my own brushless actuator — and printed nearly all of it.
Build log
The structure is 3D printed: the rotor carrier, the stator mount, the housing. A bearing presses into the printed hub so the whole thing spins true. Then I hand-wound the stator with enamelled copper — slot by slot, by hand, which is exactly as tedious as it sounds, and the part where a tiny mistake costs you the whole winding.
Printed plastic and a high-torque motor sound like a bad pairing. The trick is keeping the heat and the load in the metal parts and letting the plastic just hold geometry.