Ball Bearing Filament Guide for Side Mount Spools MK3S V2
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This is a simple dual ball bearing filament guide that mounts on top of the right side vertical rail on a MK3S.
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- Creative Commons — Attribution — Noncommercial — NoDerivatives
This is a simple and effective ball-bearing filament guide for a MK3S when using a side-mounted spool.
This guide fits right into the hex at the top of the vertical rail and utilizes two 5mm X 11mm ball bearings to provide a virtually frictionless path for your filament when using a side-mounted spool.
There are three printed parts (5 total, since you print 2 each of the axle and pulley):
Main Body (Print 1, 0.2mm layer height)
Axles (Print 2, 0.2mm layer height)
Pulleys (Print 2, 0.1mm layer height)
You will also need two 5mm x 11mm bearings, 4mm wide. These are very common RC car bearings, so a hobby shop will likely carry them. If not, Amazon has them for sure.
I've printed this with great success using PETG.
My previous design did not include the pulley rings that went around the bearings, and this allowed the filament to pull to the side and eventually cut a groove into the side of the main body. The filament would then get stuck and jam there. This new version should alleviate that issue with the grooved pulleys holding the filament centered and rotating with the bearings.
Hope you like it and definitely open to any feedback you have!