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Print issues when moving from Cura PE 21.08 to 3.2.27

Posted: Mon Sep 17, 2018 2:59 pm
by micahsa
We currently run a couple Taz6's using Cura PE 21.08. We've had a stable quality print profile for well over a year but would like to upgrade Cura to the latest version to take advantage of new features. Every time I try and print using Cura 3.2.27, our prints have gaps in the walls, what looks like retraction issues, and I can't for the life of me figure out how to fix it.

I've tried the out of the box profiles, replicated as close as possible our current Cura settings from 21.08, and tried probably six different adjusted profiles, but nothing addresses the issues.

I've attached images of our current working profile and a few images of our cookie cutters that have gaps. That's pretty much all we print and all models have the same issues.

Any suggestions on how to clean thing up would be greatly appreciated!

Re: Print issues when moving from Cura PE 21.08 to 3.2.27

Posted: Tue Sep 18, 2018 11:00 am
by Galadriel
It looks like for the most part this might be a matter of a little bit of under extrusion, when you updated to the new Cura and flashed your firmware did you also make sure to update the E-Steps on your printer so they were at the correct setting? If not or if you aren't sure you can try using this calibration guide to check for any discrepancy in your extrusion: https://ohai.lulzbot.com/project/fine-t ... libration/
I also notice in one of your photos there is a line up the inside of the model, this is most likely due to a setting called "Z Seam Alignment". Essentially the Z-Seam is the point at which a layer starts and ends, whenever you stop one layer and move to the next there is a small difference in extrusion in that spot due to the retraction between layers. If the Z-Seam alignment has all of those areas meet up at a single point in the print it will cause the line you are seeing, you can adjust this setting to Random and it should help with the visibility of that mark.

Re: Print issues when moving from Cura PE 21.08 to 3.2.27

Posted: Tue Sep 18, 2018 11:25 am
by micahsa
Galadriel wrote:
Tue Sep 18, 2018 11:00 am
when you updated to the new Cura and flashed your firmware did you also make sure to update the E-Steps on your printer so they were at the correct setting?
Yes, though I'll certainly run through the configuration again and make sure things are accurate. The thing is, when I print with Cura 21.08 the exact same model looks great, with no gaps, holes, or under extrusion. It's just slicing with Cura 3.2.27 that causes the issues.

As far as the z-seam, I actually prefer the seam aligned as we can typically hide it in a corner.

Worst case, we stay on 21.08 and print as normal. It just means we can't nest models inside each other (a 2" cutter inside a 4" shape for example") and lose out on the other improvements.

Re: Print issues when moving from Cura PE 21.08 to 3.2.27

Posted: Fri Oct 26, 2018 6:49 pm
by sbierly
Hey, did you guys ever figure this out? I have a similar problem, can't figure out how 3.2.27 could have such a problem as I'm having and it isn't widely seen--I can't print anything at all, nothing extrudes. PE21.08 prints the same objects and configs all day, 3.2.27 prints nothing. I'm also using eSun PETG---scary coincidence, maybe I'll try another filament and see what that does.

Re: Print issues when moving from Cura PE 21.08 to 3.2.27

Posted: Mon Dec 17, 2018 5:22 pm
by micahsa
sbierly wrote:
Fri Oct 26, 2018 6:49 pm
Hey, did you guys ever figure this out? I have a similar problem, can't figure out how 3.2.27 could have such a problem as I'm having and it isn't widely seen--I can't print anything at all, nothing extrudes. PE21.08 prints the same objects and configs all day, 3.2.27 prints nothing. I'm also using eSun PETG---scary coincidence, maybe I'll try another filament and see what that does.
Sorry I haven't responded to this. No, we never did figure it out. I took one of the Taz 6's offline and spent several days troubleshooting print after print. Ended up getting close, but still had a ton of little gaps in the walls. Same model with 21.08 printed perfectly. Lulzbot support was very responsive, but it was all mechanical troubleshooting, (checking clogs, esteps, pla swaps, etc.) nothing related to the actual slicing profile, which is obviously the only change. So, I'll probably get the itch in another couple months and try to figure it out again, but I've seriously spent so much time already its rarely worth it to have a printer offline for that long.