Print shifting - Both X and Y

[coopdway]

Hi,
I've been printing everything in PETG these last few months and successfully, once I fully appreciated the importance of keeping my filament dry. Last night I loaded my biggest file ever, using 7.5" of my MakerGear table in the "X" dimension. After many layers (not sure of the count), I'm guessing ~8mm high, the entire print shifted off the platen almost 1.25" in X. After attempting to print another 5-6mm in height, the entire model shifted almost 2" in Y. It was an 11 hour print job, running unattended over night. This morning I found this mess, aborted.....

I've read through the related Posts that I could find, checked for loose pulleys, belt tension seems OK or very close. The printer is in my shop outside, humidity controlled, 65 - 70 degrees at this time of year. What else can be wrong?

Thanks,
Doug

[brian442]

Have you read this?
https://www.simplify3d.com/support/prin ... salignment

[coopdway]

Read it long ago before I was having trouble and forgot to go back and look, thanks for the reminder.

[witmore1]

If the above troubleshooting page fix it, it could be that you are exceeding your build plate size,

I have added a glass build plate to my FFCP and using 8x10 glass I can print beyond the 6x9 original build plate, but not by a whole lot,
when I have sent files to it that hit a an extreme it causes a shift after that point.

your part fills the bed pretty close to the edges but the skirt looks like it might be really close to one edge I can't tell exactly though.

[coopdway]

Read the Troubleshooting Tips, made some changes and printed a model that I'm very satisfied with. I'll post a GOOD photo this evening.
1) Rebooted everything
2) Checked lock screws, all seemed tight. Did tighten up belt tension slightly.
3) Slowed printing speed to 75%
4) Print ran over 18 hours+ which meant overnight. The shop has a ceiling fan that normally runs but overnight, lights out, no fan. I plugged in a table-top fan nearby and ran that during the entire print run.

Witmore1, part is 7.5" in dia and you are correct, the Skirt did run off the table. I worried about that until 25 layers were down and all seemed OK with the model itself.

Appreciate the help, my customer even more so!

[coopdway]

Here's the finished print run.