UM2 Bearing Filament Roller
By JimboJones
Free
It's free to download
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Technical
measurements in inches:
2 - .250 x .625 x .4724 bearings (Crown Bolt 65628)
I used these bearings: http://www.homedepot.com/p/Unbranded-0-250-in-x-0-625-in-Precision-Bearing-and-Reducer-65628/203537336
1 - 1/4" x 6" bolt
2 - 1/4" nylon lock nuts (nyloc)
2 - 1/4" fender washers
Free