Well, i gave up trying to get Petg to work and went back to Hyper PLA i was previously printing with it with no problem at all i was using the default hyper PLA settings, but now it seems just as bad as the petg… The first layer goes down fine but 2nd layer onwards is messy it seems to string, doesn’t stick together, and the walls have cracks in them.
Is there something im doing wrong? I’ve dryed it, changed the flow rate, speed, temp and nothing seems to work, can someone help me out its making me go crazy!
You may need to do a cold clean, may be your PETG is contaminated and some particles where left on the nozzle.
All these steps are available from the printer menus. Note: you should do this with the PTFE tube out so you can grab the filament in step 4.
Heat the nozzle to 220C if you are using PLA for this (250C if for PETG or PLA-Nylon).
Extrude filament thru nozzle (white is best for last step).
Change temp of nozzle to 95C
Grab filament firmly and pull out. You should hold the extruder lever back while doing this (right next to where the PTFE tube goes in). The idea is to have the filament plyable but warm enough to pull. It is meant to bring other filament artifacts with it.
Check the filament for debris and repeat till filament comes out clean.
Heat the nozzle to a higher temperature than that was used for PETG… after two to three minutes push PLA manualy through the nozzle, the left PETG will come out and nozzle can be used for PLA (on lower temp) again.
I always use this methode because a cold-clean on my K1-Max doesn’t work (can’t pull the cold material out!)
Try a “cold-pull” as described earlier, and if three of those fail, try a new nozzle.
If you have many hours on the nozzle heater, it may be time to disassemble it and apply new heatsinking grease. Over time, this grease dries out and leads to nozzle temperature fluctuations. IIRC, there is a locking allen grubscrew on the heater ring to remove first, then the heater ring unscrews in reverse-thread. Then the heater slides off. Clean everything carefully, re-grease, reassemble.
Be careful about exceeding a filament’s temperature (this can happen from dried-out heater-grease.) Mr_MBR’s plan could work, but you must not let a filament sit overheated in the nozzle for very long. Overheated filament could scorch / burn / turn to carbon (vitrify), which is the worst kind of clog. Once had someone raise PETG nozzle to 300c to “clear a clog” and well, that just made things much worse…
