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**WARNING: I DO NOT RECOMMEND USING THESE CLIPS WITH BRITTLE FILAMENTS SUCH AS PLA. Use a stress-free clip instead.** Although they seemed to work great, I have discovered that after a few months with the clip in the same place the tiny amount of stress from the curvature in the clip causes sufficient strain on my PLA filaments to break them! My filaments are old, stale and in a cold basement, so those may have been contributing factors, but I cannot assume with any confidence that this won't also be problem in a warmer environment with fresher filaments. My apologies to anyone who has used them and run into the same problem.
Any other clip designs that stress the filament even just a tiny amount will have the same problem. I also have had filaments break even when using stress-free clips, but I want to minimize that risk, so **I'm now using the stress-free** [Universal Dual-Filament Dragon Clips](https://www.thingiverse.com/thing:3757356). If you want a good stress-free clip that doesn't clip to the spool, try the tight version of the [Filament clip *by motoz*](https://www.thingiverse.com/thing:2817985).
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These are the features of this clip:
+ Uses absolutely minimal material! Uses as little as 0.14 m.
+ Prints extremely fast! ~~No other filament clip prints as fast.~~ See "Is it really the best?" section below.
+ Clips onto filament very easily! It doesn't get any easier.
+ Provides superior gripping performance! Guaranteed to not slip.
+ Doesn't clip…
