Yet Another PETG Weirdness Question
I am printing a set of large pieces (rotary tool workshop) that appear to be reasonable quality models. They printed fine in PLA but I decided to redo them in PETG for sturdiness. No I am having problems I've never seen before.
The first attempt printed 90% of the model and then went spaghetti for the last 5-6 layers. I was out of filament so I reloaded with a brand new spool of Prusament Black and resliced using the Prusament PETG 1.5 profile. The first few attempts went spaghetti right away so I scrubbed the silk plate and retried. Got a few layers down (as you can see from the attached photo) and then it went spaghetti. My only theory is that the nozzle is worn out (?) It's like the Prusa Brass High Flow nozzle is getting some kind of flow problem in mid-print??
Hoping somebody has a better diagnosis.
RE:
Looks like a layer shift occurred. I, too, print a lot of PLA and a lot of PETG. With PETG, you can get a lot more blobs building up on the nozzle. Occasionally, those blobs attach to the part, then harden, and cause a subsequent crash. It seems to help by increasing the printer setting for retraction from 0.7 to 1.4. YMMV
Also, make sure you have good adhesion to the bed. PETG tends to curl more than PLA so it’s imperative to have a clean plate. If it curls too much, again you have a crash. Satin works best for me, but textured can work well, if it’s really clean.
MK4S/MMU3
RE: Yet Another PETG Weirdness Question
It also can help to slow down the print a bit with the speed control on the printer. Better one successful print at a little slower speed than several failed fast prints. 🙂
I have found that the input shaping moves the nozzle a bit too fast and abrupt sometimes and slowing down the print helps in this case. This is very model-specific.