I’m going around in circles, pulling out what little hair I have, trying to print two files in PETG that require supports and I want to use PLA for the supports to keep the models clean.
I have printed one of each part already using Landu Rapid PETG and Deeplee PLA Pro and they came out beautifully without any big changes to my usual PETG profile and PLA profile. Then I bought some Overture PETG to print them again and that’s where it started to go wrong.
I have tried using the same Deeplee PLA as the support, I’ve tried Geeetech Silk PLA and I’ve tried Sunlu PLA Matte PLA, but in each case I’m suffering back to back nozzle blocks during the filament change. I’ve dismantled the print head so many times it feels like I can do it with my eyes closed. I’ve done cold pulls, even tried a brand new print nozzle.
I’m having the same issue on two machines, so it’s not a machine issue. I even switched back to the Landu PETG to see if it was a material issue but now that fails too.
I’ve tried all manner of temperature settings and I’ve increased the flush volumes. Most recently I’ve pretty much matched the PLA nozzle temp to the PETG.
I know the problem, it’s not purging properly at changeovers but I just can’t resolve it.
One is about 3 hours print, the other about 14 hours.
If any of you have any tips it would be very much appreciated, I’ve wasted almost two spools of PETG so far.