Spool Rails with Bearings for Prusa-Like Printers
thingiverse
A duo of detachable rails for spool housings comes with axles, ready to receive bearings for friction-free spool rotation. The rails are separated by supplied spacers; one features 12mm diameter inserts 142.5mm apart (designed specifically for Geeetech i3 spool base panels), but can be easily modified using additional spacers to match your requirements. Although the two halves of each rail don't require adhesives, the assembled rails must be secured with glue to the spacers. The width and curvature of the rails have been engineered to accommodate a wide range of spool sizes.
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