Bowden Tube Retainer Clips
thingiverse
Insert clip between release ring and fitting body to lock tube into place. They also appear to reduce the tube movement during retractions which may permit reduced retraction length. Various thicknesses are provided. Use the thickest one that fits. I created this for my Ender-2 but these should fit any 4 mm O.D Bowden tube fittings.
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