Heavy Duty Bowden Clip
thingiverse
Secure Clip for Bowden Coupling on my Ultimaker with Bondtech QR Extruder, may also fit on other 3mm-extruders. I had some issues with the standard clips and also with the ones provided on the Bondtech website, so I did my own to eleminate any play and wobbling. Tolerances are really tight (there are no tolerances...) and that is how it's meant to be. If it prints too high to slip under the collar of the coupler, put both pieces together and sand until it just fits with some force. Probably PLA will be too brittle, PETG works perfect.
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