Spool Winder Drill Attachment

I've been really enjoying my Makerbox subscription and printed some spools to hold the filament nicely. This design by spradlinb to be exact: https://www.thingiverse.com/thing:2419066
However, manually winding the filament on to the spools was proving to be annoying. So I came up with this simple design to attach to a power drill and wind the spools way quicker.
I added a little hot glue to the base of the screw piece to help grab the spool a little more tightly.
I would recommend using two spools for this. One to sit the filament in initially and a second to attach to the drill for winding.
All in all, this thing does a pretty decent job and I can not wind up 4 spools in the time I used to wind up one.
I also included a file with the screw split in half which I then glued together. I feel this should make the hexagonal shaft a bit more robust and handle the potential torque being put on it.