Printrbot Simple Filiment Guide and Z Axis Stabilizer with Bearings

This has to be one of the most useful accessories I've made for my 3D printer. I was
surprised at the improvement this made to the quality of my prints. This is intended to be
used with a desktop spool roller (like the one in the second picture,
http://www.thingiverse.com/thing:453542 ) The pulley system
really does keep the filament from binding which allows the print head to move more
smoothly.
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See Instructions tab for Bill of Materials and assembly instructions