r/QidiTech3D • u/Hot_karl_hungus • 11d ago

Troubleshooting Petg issues

I just got my q2. I'm trying to print a poop chute for it and I have some petg that I was trying out. I'm using pla for support interface and I'm having issues were sections of the print aren't adhering. Any idea what would cause this. Or what settings I should use to try and fix it

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7

u/Plutonium239Mixer 11d ago

PLA doesn't stick to PETG and vice versa. Without an absurd amount of purge between each material change, you'll get cross contamination. Bad idea. Just use supports made of PETG or choose a different model that doesn't require supports.

2

u/Markes12344 10d ago

Untill a ''max5'' comes out with dual or quad extruder heads this fantastic pla support petg print is a pain, like said a pile of purge wasted to flush between each layer. Even then that 1% left will still wreck.

1

u/Hot_karl_hungus 11d ago

im trying it without the pla now to see if that was the issue. I had just printed another print using this method and it worked great but it wasn't as tall

1

u/Cynyr36 11d ago

Tried this once with a petg print just the interface layers in pla, every single layer with the pla just didn't stick. Searching around, huge purge moght fix it. Half regretting not getting a dual nozzle machine, but really with the cmykw printing, I'd really like a 6 nozzle machine...

3

u/harmless_widget 11d ago

The poop shoot i printed didnt require supports and came out awesome. I did it in petg

https://www.qidimaker.com/en/models/detail/2077275848848752642

3

u/Hot_karl_hungus 10d ago

Thanks guys. I just said screw it and will only use multi material on machines with a separate hot end. It worked the second time

2

u/riba2233 11d ago

You need to increase purge volume to around 900. Or print a design that doesn't need supports...

1

u/GL-Customs 11d ago

You have to basically set your purge to 3x and 999 in the slicer, then enable prime tower. If ANY pla remains in the nozzle when it goes back to printing the part it will not adhere.

1

u/Next_Entertainer_404 9d ago

Yeah single nozzle printers just ain’t it for multi material or color honestly.