Printrbot Simple Metal Filament Cradle V2.0

Updated to hike up the shafts going down to allow full Z travel, and shortened the "wheel base" to allow it to hold smaller spools, such as nylon. Also prints as a single piece (not including the wheels)). Also made it able to hold narrower spools.

Thing to hold a variety of filament spools on top of a Printrbot Simple Metal. Designed to hold the spool clear of the full travel of the Z axis, with a minimal mechanism. The spool might spin OK w/o the bearings, but, hey, why not ?
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