minor 0.25 mm nozzle first layer issue, lines showing up in infill  

You are a fraction too low, try -1.330 to -1.320

and clean the print-sheet, that's the probable cause of irregular adhesion.  The irregular extrusion might be moisture boiling off, make sure you're using dry filament.

Cheerio,

RE:

I actually went quite a bit higher than -1.335 in my earlier setup as my pre-0.25mm nozzle numbers were -1.322 so I started around there, I don't have any pictures of my -1.330 test but it was close to this -1.320 test I do have pictures of. You can still see here the infill was basically perfect, but the perimeter specifically was trash. -1.342 has clearly the best perimeter out of all my tests while having a decent infill.

Either way I'll clean my plate again a few times and just double check and return with my results and try a newer filament. Although I have my doubts about it being the filament as I try to keep them as dry as possible in their original bags with extra silica gel that I cycle out. As well as it only being about 3/4 of a year old with those precautions.

Would the perimeter really behave so differently from the infill? I feel like when setting up my printer with the 0.4mm nozzle, infill was usually the less behaved thing when subjected to z-offset issues and showed the worst problems.

(-1.320 full)

(-1.320 perimeter)

RE: minor 0.25 mm nozzle first layer issue, lines showing up in infill

Alright, so I've cleaned my sheet multiple times, actually decided it was about time for an acetone clean and went that route to be sure. I also switched to a newer orange prusament. Seems like the stresses went away within those 2 changes.... However, I now also notice less differences between these smaller changes as I had before the cleaning and filament change.

I still see some imperfect perimeters though throughout them, but honestly the end product seems fine, so I'm not sure how much it matters at that point. Maybe someone will tell me otherwise, but I'm guessing that 0.25mm nozzles could be more prone to tiny extrusion issues which is why I questioned if I was over extruding earlier.

So I guess my question is just does this perimeter issue seem problematic, or since the total layer looks good might it be alright to just ignore that minor issue?

(new -1.335 what looks/ feels the smoothest to me, my pick)
 

(1.325 poorer looking perimeter but end product was fine)

(-1.330 similar to -1.335 but more rough to the touch)

(-1.342 decent perimeter, gaps appeared in edges of final layer)

I try to keep them as dry as possible in their original bags with extra silica gel that I cycle out. As well as it only being about 3/4 of a year old with those precautions.

According to Thomas Sanladerer, even in a humidity controlled room PLA quality drops in a few days.  Some filaments can deteriorate noticeably during a long print...

I'm guessing that 0.25mm nozzles could be more prone to tiny extrusion issues

The smaller the nozzle the tighter the setting need to be for *all* issues.

One common cause of irregular extrusion is the pressure from steam produced in the hotend by damp filament.

Thomas Sanladerer tests filament drying:

After a week exposed in a room with a dehumidifier running there was noticeable deterioration of PLA finish...

CNC Kitchen on hydration and drying times.

Cheerio,

RE: minor 0.25 mm nozzle first layer issue, lines showing up in infill

Right, I've seen both of those videos already, in fact you can see my comment near the top of the Thomas Sanladerer one asking about the differences between drying and just keeping it dry in the first place. Great work from both of them.

Like I said, I keep the PLA exactly as he recommend while it's not exactly a drybox, I am careful to replace silica and make sure the bags are sealed. Unless I'm grossly misunderstanding something here, that should be exactly how I should do it. I've been using these in most of my filaments Prusament Spool Silica Gel Container and Hygrometer.

The confirmation that I was right about smaller nozzles needing tighter settings overall is good to hear. At this point I'm less worried about that at the moment than I am if my first layer is correct here, or if it's something I should fix / how I would go about doing that at this point as I believe I've exhausted my z-level testing. Unless I'm mistaken I don't believe there's too much more I can do with that at least.