I use Polymaker's Polydryer boxes, that are silica gel boxes that can be just dropped onto their dryer machine without taking the spool out. While it's a decent product, the spool hub has annoyed me for a long time about them. There's just this plastic cylinder that goes there and while it's passable with plastic filament spools, it introduces noticeable drag on the cardboard ones that most of mine are these days.

I set out to find a way to modify them to get rid of this nasty misfeature.

#3dprinting