Flattened corners after slicer upgrade  

Elephant foot compensation?

does this have anything to do with Elephant foot compensation? 

does this have anything to do with Elephant foot compensation?

No.

The warping and adhesion problem you are having has two probable causes.  Most likely is a temperature shift in your working environment.  Sometimes this coincides with turning on/off central heating or air conditioning, sometimes there is a draft or a change in activity around the machine stirring more air than previously.  It can even be the season...

There is a small chance that you have a buildup of breakdown products on the build sheet, this might be time to try acetone cleaning ONCE.  Don't do it again for six months.  With several printers this is unlikely so look closely at environment temperatures first.

RE: Flattened corners after slicer upgrade

I appreciate your input - thank you - the room does not have any drastic temp changes or vents and i tried this with a new PEI textured sheet as well. This was all working fine until after i updated the slicer software and resliced my model. That's the odd thing or coincidence?I will clean the sheet with acetone, re-calibrate (first time wizard) and slice with the new slicing software and report back.

RE: Flattened corners after slicer upgrade

warping no doubt. but weird its on all your printers. did you change any part-cooling settings?

RE: Flattened corners after slicer upgrade

Hi there thanks for your input - I didn't touch any cooling settings - been using the same project file with the multi material (single extrude) settings since December 2021. I only decided to reslice after I learned about changing a retraction length setting to eliminate this extra material that was being deposited after a color change. How I figure it has to do with the slicer - is that I printed a model using the gcode before the change and it was fine, I then loaded the model and changed the slice setting for the retraction length (for multi material setup) and resliced with the newer software - that is all I can remember. I thought my model was bad, than I thought it was my sheet, they I thought it was my printer and then switched to another printer and the same thing happened - which make me think there maybe something in the new slicer causing this.  I just finished recalibrating and cleaned the sheet with acetone and currently printing a test part - that I scaled down and cut up to speed the process - normally this process is 10 hrs - with the 1st 1hr and 30 mins changing colors. Prints white for 4 mins - then black for 60, then white for 4 mins and black for 30 then white for 4 mins and then black for about 8 hrs and 30 mins.  Thanks for your reply.

RE: Flattened corners after slicer upgrade

ok then my question is do you use a default ''filament profile''? prusa does update these too. i had some isssues after the profile updates(my custom profiles have disappeared). and the default profiles did change like the min. fan speed was at 100%(35%before) and the ''disable fan for the first:'' was 1 (3before) and a few more things

RE: Flattened corners after slicer upgrade

I know it is a custom profile - and my assumption is that it should be saved with the project 3mf file. When I load the project the custom profile for the multi material (single extruder) is loaded. Perhaps I am chasing a red herring and this is just a coincidence. After my test print finishes - I will note the results, I think I can get an older version of the slicer on Github as well as a test. Just so baffling when you have done something so many times and it always works and then only thing you change is the software and you notice different result.  Appreciate the continued input - thank you.

RE: Flattened corners after slicer upgrade

So I will update - but Prusa support also contacted me and believes I am running into a coincidence. BUT they advised me not to use acetone - so I cleaned the bed on one printer with dish soap and a soft scrubby sponge - I re-sliced with the latest version of prusa slicer and increased bed temp to 67 from 65 and hotend first layet temp to 215 from 210, I also disabled cooling fan first layer setting to 3 layers. So far in the 9+ hours print I am on the 4th color switch - 3 mins white, 60 mins black, 4 mins white and now I wait - so far there does not appear to be any lifting. I am recording video of each change and noting the corners. Maybe something changed in the formula of the PLA? - I have been using Amazon Overture for a long time with much success. You can see how troubleshooting things like this can be frustrating. I always clean the Prusa steel textured bed bed with 70% IPA. BUT rarely wash the bed with dish soap - I don't use any adhesion glues etc. I will report back as I progress.

RE: Flattened corners after slicer upgrade

Update - after almost 4 hours I stopped the print with 5 hours left - it was lifting in the back corner, why is this happening all of a sudden

RE: Flattened corners after slicer upgrade

OK so - in short - I have no clue what changed - I will have to chalk it up to bed adhesion, lifting, warping etc. I have now started a 9 hour print using an outer brim - with bed temp 65, 215 first layer, 210 additional layer - fan disabled on first layer 1 and outer brim 5mm - my first short test of a slice of the model seemed to work fine. If this is how I must  go forward - then so be it, probably should be using a brim on longer prints anyway. Perhaps it was a coincidence that the adhesion on all 3 beds just started to wear and make the print lift in the corners on the same print that I have been using without issue since Dec 2021. I cleaned all the beds with dish soap - I never used any adhesives or acetone and only cleaned with IPA - is it possible that the PEI is just starting to wear? Don't know - but it is still my opinion that something changed AFTER i upgraded the slicer to 2.5. I will report back tomorrow - when the print is completed.

RE: Flattened corners after slicer upgrade

Don't you have some older gcode-files from before the update you can print? If they behave the same, you have ruled out the slicer update as a cause.

RE:

technically I did print a model right before the slicer upgrade without the issue - then I changed the model to adjust the retraction setting for the multi-material (was leaving an extra 4mm of material blob prior) - and re-sliced and then noticed this issue hence why I jumped to conclusion that it was a slicer issue.  I think I was chasing a red herring perhaps and the bed is just losing its adhesion properties - OR the PLA I am using has an issue perhaps as I switched to another roll. The print takes 9 hours and since then I wanted to make this work with the new slicer and bought a new pei texture sheet and now also using some "bed weld" and so far so good. Prusa support assures me it is nothing in the slicer. so I just moved on - I guess we would've heard more about this issue if it was the slicer. Such as certain cooling properties changing etc. Thanks for your reply. 

RE:

@mgtarallo

Is this what happened?
It all works great, on three printers?
You upgrade PS and print is crap, on three printers?
You print old gcode file and it all works great, on three printers?

If so, go to github, download old version and slice it.
If you have overwrite your 3mf-file with the crappy? 2.5 version you can extract your settings from old, good, g-code.
Do this BEFORE you start messing around with settings, different bed cleaning and so on
("Please, stop inventing", if you are in to Formula 1 you know what I mean, otherwise google "carlos sainz stop inventing"  😊 )
If it works with an older version do as @robin said, compare old and new files, the difference is your answer 👍 

Yes, there exist virus in programs, (I thrust Prusa don't get me wrong!!) but I have never heard of virus in programs that affects bed adhesion (on three printers) 😉 

edit: I see now that you solved it, great 👍 👍 👍 (you posted while I was writing)

RE:

Thank you 🙂 - yeah I hear you about "Stop inventing" - I get caught in a pattern of things that work and then when one thing goes astray I blame the software,  I should not do that. I love Prusa and think they make a fantastic product. Stay well