I had to stop a print last night after about an hour into a 11 hour print. I was getting ready for bed and casually looked at the job before turning in. I was surprised to see that a lower portion was suddenly looking bad in an area that was nearly completed (see photo). I got up this morning and tried printing a test piece about the same size with the same filament, same settings, same process settings and it turned out great. What the heck?
I’m still relatively new to this game, but from looking at many troubleshooting discussions, and a bunch of photos, it looks like maybe a problem with under extrusion, perhaps a clogged nozzle? There were very smooth lines right up to the problem (see photo). So, can a nozzle unplug itself, or did something else happen last night? BTW, I’m currently running another print of a FreeCad model of mine, and again, everything appears to be smooth (at least halfway through the print job).
I’ve never had a nozzle clog before or seen this sympton on my printer. I even hate to post this, because there are so many opinions for causes out there that can overwhelm a person trying to get a little help. I’m thinking of doing a cold nozzle pull just for GP.
P1S printer bought in Jan. that only has 454 hours on it
Textured PEI plate
Door closed, top slightly open
Using dried Petg HF filament kept in AMS with lots of fresh desiccant or dry box with same, below 20% RH
Filament profile: 230C nozzle, 75C bed (initial layer), 18mm/s max volume, Aux fan turned off, no cooling 1rst 7 layers
Process profile: Modified .16mm process - 60mm/s top surface, slowed acceleration to 5000, ironing, etc. - this is a well used profile with me. See photos of problem, and next day a similar print. Thanks for looking.