I think everyone who has a k2 plus will have experienced the dreaded ptfe popping out of the factory connector due to the teeth breaking. If you haven't, it will happen soon!

Save yourself the heartache of waiting on replacement parts by printing this adaptor, and using a standard pc4 m10 fitting instead.

Screw the pc4 m10 fitting in carefully, and do not overtighten it.

To install it, simply pop out the black retaining ring with a small flat screwdriver - be careful! Remove the top left hex bolt, and fit this adaptor in place using a new 25mm long cap head hex bolt. You will have to file a small amount of material away on the factory hot end cover - I used some 220 grit wet and dry paper wrapped around a 20mm popsicle stick (tongue depressor). The ptfe tube should push through the new connector, all the way into the hot end.

I would highly recommend using a high temperature filament for this, I used ABS.

My settings were:

0.4mm nozzle

270c hot end

80c bed

55c chamber temp

10mm brim

normal snug supports

6mm3/s volumetric speed

model fan 30%

no side or rear fan

0.2mm layer height

Creality K2 plus PC4 M10 extruder adaptor

ABS, 0.2mm layer, 2 walls, 15% infill

0.2mm layer, 2 walls, 15% infill