That’s what [Russ] did to make needed improvements to his CNC flat-coil winder ... in the frame and provided a small preload spring to keep the coil roller in contact with the paper.

Each arm holds a small neodymium magnet suspended over the center of a flexible PCB coil, quite like those we’ve seen him use before as actuators and speakers. The coils are controlled by a ...

Main wire = 4 x circumference of bracelets (if you want to get thicker you can use 6 times) - Coil spring = 15 ... main wire 04:39 Twisted coil spring 06:38 Flat... Soccer star Sophia Wilson ...