I based this off of laird's spool feeder, but my filament guides were not long enough to unclip them.
Has nice smooth round guides with clips that allow the filament to be "clipped in" making removing/changing filament spools easy.
This works with Octave & Makerbot spools and maybe others as long as they aren't much larger diameter than the Makerbot spools.
Uses 2 standard size zip ties to attach to wiring harness.
UPDATE v2 posted - 2012/09/03: I removed v1 of the STL, as there was missing filament on some of my prints. But I later determined it was my delrin washer wearing out and not applying enough pressure on the Octave filament. However... there was some resistance from the guide. I have posted v2 of the STL with the guides 45mm away now vs 55mm away. This should fix the resistance issues I saw. Tinkercad has been updated as well, I have not printed this new version yet.
Printed with .27 layer height, 10% infill & 1 shell (2 in total), no support or raft. Support is not required. Your replicator should be able to span the space where the zip ties go through! I have printed 4 of these during testing and the holes for the zip ties have never had an issue without support.
As mentioned by gth below in the comments. Print without support/raft! I do not use a raft for anything I print on my Replicator.
Insert 2 zip ties. Position it almost at the top of the wiring harness and carefully tighten the zip ties. DO NOT over tighten the zip ties, just tighten them enough that the guide can move with a some effort.
Clip in your filament - you may have to spread the clip apart slightly.
Original Tinkercad Object: