Tired of moving around two objects tethered together by filament, I drilled a hole in a piece of plywood, glued in a length of dowel rod, and zip tied the thing to the back of my MakerBot. On this I placed my cardboard spool. Now I have a less cluttered space and my bot can easily be put away.
I used the filament back pack with the Paxtruder to print a bottle opener. It was held on by zip ties, so you can see a lot of wobbling along the Y-axis.
EDIT 2010-03-19-0732:Take a look at a nice version by Kevin Curry. He made dividers that fit over the barrel to organize his MakerBot ABS Rainbow Pack. He’s also been using the cardboard’s corrugations to secure the end of this filament spool. Below are Kevin’s pictures from the filament page on Thingiverse.