Filament Winder/Transfer

I have several 3D printers and I needed some way of easily transferring filament from one spool to another so that two (or more) printers could be printing from the same spool of filament. I use Hatchbox brand filament and their hub design makes this pretty easy.

I used a 1/4x20 threaded rod, nuts and washers to make the drive shaft and a wing nut to secure the empty spool to the shaft. Any drill can be used that can handle a 1/4 inch drill. I used a bench vise to hold a standard spool holde