Departing somewhat from this hardware hacking lingua franca is [tuenhidiy]’s automatic coil winder, which instead of aluminum extrusions and 3D-printed connectors uses simple PVC pipe and ...

If you have a whole lot of sewing to do and can afford it, an automatic bobbin winder is a godsend ... falls down a ramp and into a rack, and the thread is severed by a piece of nichrome wire.