Now you'll be able to keep a couple spools of extra filament right by your enclosure!  Or, run your current filament off the spool holder and right into your printer!  The spool holder can also be used to mount a fire suppression system (sold separatley). **NOTE: Quad spool holder ONLY works with Model 870 enclosure!  It's too wide for the Model 660! **Must be ordered with enclosure.  Cannot be installed once enclosure leaves our factory!**