Ball Bearing Roll for Adjustable Spool Holder for the Original Prusa i3 MK3 ENCLOSURE
thingiverse
Here's my take on the ball bearing rollers for the Prusa i3 mk3 enclosure. There are a few variations, but one version has a nice fit where the axle can't turn and can be printed without supports. I've added an edit to this post on September 10, 2019: I've also created a wider version that works with Yet Another Adjustable Spool Holder for Enclosure by rshartog https://www.thingiverse.com/thing:2908177 On February 24, 2020, I made another edit and noted that these rollers use the common 608 type bearings.
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