Ender-3 V3 SE attachable string guide
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I just hated how sometimes filament unwinds on the spool, so I designed this thing. It mitigates it. Kinda.
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Model information
- Source
- Printables
- Category
- Creality Parts & Upgrades
- License
- Creative Commons — Attribution — Noncommercial
So, sometimes when the extruder head moves up and right, it causes the filament to unwind on the spool. Especially when I have some more springy ones. This part can be attached to the top bar of the printer and mitigates this effect. String can be pulled in without interruption. 
Recommended material is PETG, the model already contains supports. It should fit tightly on the top bar of the printer. If it does not, just sand down the part without holding balls, until it fits. When it does, it should not move around easily. After removing supports (leftover studs can help hold the part in place when attached), there should be no other need for post-process.