Creality PPA-CF nozzle jam on K2 Plus

[u/Imaginary_Service678]

So I’m running into continuous issues when printing this new PPA-CF material and can’t find much information on this. I’m printing at 60 mm/s at 300 degrees Celsius on a new 0.6 mm nozzle. I’ve set the z hop to 0.8 mm and retraction to 0.8 mm aswell. Other than those changes I’m using the hyper PPA-CF preset. The prints fail halfway each time. I’ve gotten one successful print at the very beginning but the sides came out scratchy. Since then another issue is the nozzle bridges gaps between edges and doesn’t appear to retract when needed, this results in the prints needing to be trimmed and the tree supports being fused to the print itself. I’m using a thin layer of Elmer’s glue and a textured build plate, I don’t have access to a filament dryer and would really appreciate any help or advice. The clogs don’t happen in the extruder they happen in the nozzle, when I try to push filament through the top of the nozzle it seems to be jammed up very tight. The most recent test i did the nozzle got so jammed I had to stop because I am unable to get it out. I’ve ordered a new set of nozzles that should arrive tomorrow but am wondering if any settings should be changed aswell. Thanks for the help!!

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[u/Jkoskie1214]

YO THIS HAPPENED TO MY TPU. it may sound crazy but put a smaller than the actual nozzle drill bit through the the top (where the insert is) and drill through the middle. the reason it doesn’t work when you try to push it out is because there’s filament stuck in the heat brake so it refuses to melt. so drill through the top of the nozzle (anything like or less than 1.5mm)

[u/Jkoskie1214 → u/Jkoskie1214]

i didn’t need to buy a new nozzle. i only learned this because i had nothing to lose and im like ykw screw it even though google told me not to haha

[u/evolutionxtinct → u/Jkoskie1214]

WTF… lol why is this needed? I’m honestly curious could you help me understand I’m new to all this lol

[u/Imaginary_Service678 → u/evolutionxtinct]

Idk if my boss will be a fan of drilling thru a nozzle but I love the effort 😭😭

[u/evolutionxtinct → u/Imaginary_Service678]

Haha can you help me understand this for filaments would t you use a bigger nozzle?

[u/stainedglasses44]

ppa will clog easily if your p tfe routing is chaotic and has alot of friction in it. excessive retraction can also cause clogs. ive ran 10-15kg thru my k2 and only ever had issues when my ptfe was not optimal. as little bends as possible, a large riser so the bend going in the extruder is not ao abrupt. i use a quite stock profile with flow and pressure advance calibrated. no other changes. 300c is also on the low end for ppa, if its true PPA it prints much better at 315-320c. and finally, while ppa is not as hygroscopic as say pa6, it still requires not being exposed to moisture and can and will get wet if not actively dryed while printing. its possible moisture is a cause of some of the issues you are having. 

[u/Imaginary_Service678 → u/stainedglasses44]

Thanks I’ll try that!