Maybe I was just lazy, but I didnt want to have to remove the spools from the back of the replicator in order to quickly print another color...
With this this spool holder and some mirroring, one could potentially mount 6+ spools to a replicator.
This design is quite blocky and unrefined. I was in a hurry to add another color..
Use the spool holder from the original:
Print. Check your orientation before attaching the two pieces. It's a tight fit. Putting them together upside down can cause frustration...
In some cases running a sharp metal object across the corners may help.