Needle roller bearing filament spool hub
thingiverse
The needle roller bearings on Amazon are placed in a "hub" for resting your filament spool. The bearings used are http://www.amazon.com/gp/product/B006KT1B80/ref=oh_details_o00_s00_i00?ie=UTF8&psc=1 and are large enough to fit on a 1/2" electrical conduit's standard diameter.
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