PrintrBot simple metal filament guide

This PrintrBot Simple Metal Filament Guide uses 6x13mm V-roller bearings to guide the Filament to your Printrbots point head with minimal friction. a built in filament cleaner wipes the filament free of dust and other contaminants.

Works best with the Universal spool holder fitted with the V-roller bearing guide.
http://www.thingiverse.com/thing:1443303
http://www.thingiverse.com/thing:1474236