Ball bearing spoolroller
thingiverse
Spoolroller using 4 standard ball bearings, type 608 8x22x7 mm, commonly found in inline skates, effectively minimizes the friction of the spool. For printing, you will need four of each part and also four ballbearings. If you prefer to use printed bearings, consider trying this: https://www.thingiverse.com/thing:2396503 or other options available here on thingiverse - I haven't tested them personally. Designed specifically for the original Anycubic i3 Mega spoolholder, a similar model can be found at https://www.thingiverse.com/thing:2512933.
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