This is a Wool winder I am designing for my wife's knitting hobby. It's currently a work in progress. Next to come is the yarn swift.

I designed it to be built with M8x80 bolts, nuts, and skateboard bearings (since this is a standard bearing that you can buy a cheap bag of).

The current version does not (yet) have an eyelet to align the yarn. I am also planning to improve the attachment method for the gears. Once I've got all this sorted, I'll move on to the yarn swift.