Filament Spool Stacker
Description
Instructions
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The copy of this that I printed for my makerbot is one of the most useful mods to the makerbot that I have done.
Thanks!
Update: New version uploaded that allows you to mount the spools upside down so that the filament unwinds counter clockwise. Doing this allows for less resistance in a more gentle curve when combined with my Filament guides http://www.thingiverse.com/thi... It also makes it easier to pop spools on/off the bot since you can leave the spool holder inside the spools.
Update: I tried it with 2 spools and housings and the spacing is good and it works well!
I just uploaded a new version with slightly different dimensions so that it snaps into the top of the spool holder for a better and more stable friction fit. I also added trapped nut slots to make it a little easier to get those annoyingly tiny m3 nuts on inside the tube.
Can't you test it by leaving the bottom holder empty and putting the spool on the top holder?
License

This part seems to crack as easily as the spool holder that goes with it.