Crashed print due to bubbles
Hí,
I have a 4 year old Prusa MK3S printer and I have problems printing.
Mostly after the first layer the printer starts to print bobbles, blister (don't now how to describe it better), but have a look at the attached image. My print crashed than.
Firmware is the most recent, I did a full calibration 3 times, but no success. I also used the same printer settings as always. And I did an isopropanol bed cleaning too.
My prusa PETG filamament is about 2 years old. I did a drying before the last failured print but still no success!
Maybe one of you have an idea? Or I have to order the Prusa Core One 🙂
Bernd
RE: Crashed print due to bubbles
You'll save yourself a lot of money ( and trouble ) purchasing a new spool of filament instead of a CoreOne.. 😊
After two years that filament might be in pretty bad shape. In what conditions it has been stored during all this time ?. Maybe it's so full of water than it needs many, many hours in the drier to restore it back to normal, if that's possible. How did you dry it ?.
On the other part, the problem may not be only moisture. Are you positive that the nozzle isn't partially clogged and/or that the Z-offset is correct ?
RE: Crashed print due to bubbles
Hi Artur5,
thank you for your response!
I have done the drying only once recently. I stored it beside the printer under no special conditions. Just down the ground by the printer. I dried it in a Creality Space Pi for 6 hours, The drier told me that the moisture is ok.
OK, but you gave me a lot of super tips. So I'll buy first new filament and will check the nozzle. The Z-offset should be ok, but I'll check also.
THX, Bernd
Your first layer Z offset calibration is too low. Raise it until those ripples go away, the first layer should be a smooth sheet that doesn't fall into strings when bent. If in doubt show us the built-in first layer calibration print *on the print sheet*
And your filament is still damp. I suspect the spool got damp all through but your drying was not long enough to get beyond the outer layers. Dry for two hours every day for a week to give the moisture time to migrate slowly from the inner layers to the outer.
You are on the right path; PETG is very hygroscopic, even if you think it is dry it is always worth drying more before printing.
Cheerio,