100 bobine per macchina da cucire in plastica trasparente, classe 15, per macchine da cucire, per macchine da cucire Brother, accessori da cucito SA156

I've been experimenting with hobby robotics for a while now, and wanted to try a pulley-based system. These little bobbins are rigid, low friction, uniformly manufactured, non-abrasive, and have a small hole in the side wall that is perfect for securing the pulley string. I'm attaching them to the motor spindles using 3d printed bushings and a touch of CA glue. This was a super low cost alternative to purchasing 'official' metal pulley wheels, and lets me get my geek on without breaking the bank.As best I can speculate, they'll work great for sewing thread as well!