Hi BranPie, I was talking with a mechanical engineer friend about making a ropewalk and about gears and bearings.  He then quickly found the files for a 3D printed ropewalk which had been posted on another forum by someone called "epicdoom".  My friend then printed and assembled the device and gave it to me to do my worst.  It functions well but has some limitations.  I'm still experimenting with it but it does produce reasonable rope.  It uses standard 608Z skateboard bearings which I mana