The various parts of a sewing machine. [Public domain], via Wikimedia Commons. To the left of the pulley are the two arms containing the gears, shafts, or belts transfer motion to the needle and ...

Having heard it was possible to hack them into doing a 3-step, [GYOC] set out to learn Tinkercad and grow their own sewing machine parts. The new zig-zag top hat cam in place. So once upon a time ...