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Holds needle roller bearings from Amazon in a "hub" to rest your filament spool on. These are the bearings I used: http://www.amazon.com/gp/product/B006KT1B80/ref=oh_details_o00_s00_i00?ie=UTF8&psc=1 They're large enough I.D. to fit onto a piece standard 1/2" electrical conduit.
Needle roller bearing filament spool hub
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Needle roller bearing filament spool hub
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$
Delivery (May 05 - May 07)
Free
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$