This is a simple spool holder that I made for my Lack enclosure but you can basically mount it wherever you want.
7/4/2017
I added a filament guide because the spool kept 'unspooling' itself (if that's a word hahaha)
It's a friction fit and just slides on spoolholder.
The little cylinder between the spool and the filament guide is a dust filter, this is not included as it's just a file I got from thingiverse.
The author hasn't provided the model origin yet.