Use this to prevent damage to your Creality K2 Plus extruder's bowden connector, which may fail if the PTFE tube becomes loose from the cable chain and starts wobbling tearing itself out, damaging the connector teeth.

Note: If you already have a broken extruder connector, you need other solutions (like this or this) or replacement part 4001020081 K2 Plus Extruder Front Cover. This model is to prevent the damage, use it with a new machine or after you replaced the broken part. No need to modify anything on the printer, it's just an add-on.

How this works is by removing the strain of the tube at the root of the connector, by keeping it straight right above it. It was designed so the original cover of the extruder head remains in place, moreover, it relies on the cover itself to keep the tube in the correct position. It's just that the PTFE tube starts bending during movement not at the connector, but above this part.

Do not glue this to the cover nor the chain fixer! It needs to freely move up and down on the tube when the extruder cover is removed, as it remains on the tube. All you have to do is, when you put the cover on, make sure it attaches properly by slipping in place with this part, as shown in the photo. Of course, to be effective with this add-on, you need to always use the cover from now on, as intended by the factory.

Choose an appropriate filament material for your usage. Since it's not close to high temp sources it's not critical, but if you often print high-tech materials, it may be worth printing this one with some high-temp resistant filament. I used 40% infill.

Also see some tighter clips for more secure clips to manage the tube above the chain, and the cable chain cover for even more firm bowden fixation.

Remix of my own… Designed in FreeCAD - project included.