Print Speed and Stealth Mode
Did the conversion to the Core One and immediately starting having issues I never had with the MK4. After several attempts to fix this problem I realized the one difference between the Mk4 and Core one is I always ran the MK4 in stealth mode. I enabled stealth mode on the Core one and the problem went away. Now I'm thinking this is just more of a speed issue and looking for advice on where to start adjustments. I'm not new but no expert either. First layer is perfect looking and then it starts this. I also had a spaghetti failure that I believe is related.
RE:
I'm not sure I'll be able to help you, but can you share with us what you have tried so far? I expect stealth mode to slow down the fastest movements, the same movements that require maximum throughput on your extruder. This may be under-extrusion as a result of your temps being too low for this filament. I would also double check that you have the slicer profiles set up correctly.
During transition (conversion) from Mk4s and Core one, there are multiple ways in which you can miss a profile update and cause PS to create gcode based on remnant settings from your Mk4s profiles. If like me you only have the one printer, it may be easiest to remove all profiles for the Mk4S, across PS (including filament profiles) and then start fresh by adding ONLY Core One profiles. For that matter, you could completely remove an purge PrusaSlicer and then reinstall fresh.
-Jeremy
RE: Print Speed and Stealth Mode
I did go back and run some temp tower and other test but after I enabled stealth mode. What I probably need to do is disable stealth mode for these test, wasn't really thinking. It doesn't look like under extrusion, I know its hard to tell from pictures but it looks more like the nozzle id digging into the previous layer or I'm getting blobs that's dragging on the print. At first I thought it may be due to the chamber temperature being warmer than the open MK4 but even with the door open and lid off it doesn't make a difference.
RE: Print Speed and Stealth Mode
Core One user here, was seeing the same issue when using Speed profile on longer prints.
Do you hear extruder gear clicking noises when the prints starts failing (as in the above image)?
It may not be the same underlying issue as I am seeing, but I do see the same effects: garbled surface printing and globbing on the nozzle (particularly with PETG). Note that I do NOT use Stealth mode.
After much troubleshooting, I discovered that my issue was related to excessive friction on the spool (as I was using a Polydryer directly for filament).
I spent considerable effort looking to reduce friction (including custom bearings and spool adapters to reduce as much friction and sideways movement).
This has removed almost all issues with the STRUCTURAL profiles, but I still see issues with the SPEED profiles. Unfortunately, even when buffering the filament (so effectively no friction), I still sometimes hear extruder clicking (and the associated garbled prints and globbing), so may be related to filament? (Overture PETG, as I don't recall having issues with Prusament PETG).
Am continuing troubleshooting, but I effectively must run certain PETG large prints in STRUCTURAL mode, since SPEED profile still causes the clicking/print artifacts/globbing.