PETG Issues on Mk2

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zenbike

(@zenbike)

Active Member

PETG Issues on Mk2

I’m having some issues getting the Mark 2 to work with PETG. It prints well with nominal values using PLA.

The trouble seems to be 3 things, though I’m new to this so I could be missing something.

If temp is set at nominal values from the slicer, it drizzles from the nozzle, which creates a clump of material that jams up around the nozzle and interferes with the print.

If I lower the temp a few degrees to get the drizzle to minimize enough to not be an issue, it doesn't want to stick to the bed.

Also the first layer looks like a spiderweb, no compression, and no welding to previous lines. Live Z started at about -.350, so I adjusted it on one print until it was getting good coverage. Then I restarted the print to get a good print all the way through.

But when I restarted the print, it went back to being a spiderweb, even though the live z was at -1.000, adjust it again to -1.5, layer starts looking good, restart to get a clean print, and I'm back to a spiderweb.

It like it’s resetting the live zero point base calibration number each print.

Any advice would be appreciated.

Napsal : 09/01/2020 5:55 pm

zenbike

(@zenbike)

Active Member

Topic starter answered:

RE: PETG Issues on Mk2

The drizzle is not really liquid, just not quite solid enough to not extrude from the nozzle. I had issues with it as soon as I switched to PETG, and thought it was a nozzle issue, and on investigation, found that the extruder was leaking between the heat break and the heat block, and had sealed itself with PLA, which seal failed as soon as I used PETG temps. To fix that, I bout a new ESD V6 nozzle, heat block, heat break, heater element, and temp sensor, and replaced them These issues are after that replacement.

Nominal Temp for “generic PET” in PrusaSlicer is 240°/90°. I tried it down to 230°, which is the minimum listed on the roll of Overture PETG I bought, and it helped with the drizzle, but then it didn’t want to stick to the bed.

I also tried Prusament PETG, with the Prusa default settings in the slicer for that, with essentially similar results. Also, the finer I set the detail level, the worse the problems get.

And I’m not sure what connection the 1st layer issues have (or don’t have) to the rest of it.

Napsal : 09/01/2020 6:41 pm

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