Another Ball Bearing Filament Support Ender-3
thingiverse
The filament roll holder uses a central 8mm diameter metal or plastic tube on which the two ball bearings are fixed. Print vertically and use the supports for the main support. I bought the ball bearings here. http://bit.ly/2TSHYj2 It is used with a filament weight scale see https://www.thingiverse.com/thing:3537459
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