After 20 great prints, I decided to print a model (which I have successfully printed several times) at 0.08mm layer height only to see separated outer wall lines.
Initially, I thought that it was bad layer adhesion to the bed so I cleaned it with soap and hot water followed by isopropyl alcohol. Again… nothing.
The color I used was used before a day.
I dried it for 12 hours at 60 degrees celsius. I also tried other filaments and had the same result.
Then I tried to figure out what changes I did between this time and the previous successful prints of the same model. I changed the layer height from 0.20 to 0.08mm.
Finally, I reversed to 0.20mm and everything was printed just great.
What is the reason?
It’s the default speeds and accelerations for the .08mm layer hight with a 0.4mm nozzle
They are simply too fast for such a fine layer hight
You should get better results by switching the nozzle diameter in the slicer from 0.4mm to 0.2mm or you could slow your defaults speeds and accelerations if you keep it at a 0.2mm nozzle in the slicer
Personally I’ve found that even with a .16mm layer hight my speeds and accelerations needed to be slowed down to get nice results
The 0.4mm nozzle can certainly handle a very fine .08mm layer hight but the default speeds are just too fast
I’ve got and used my 0.2mm nozzle and the default settings are pretty good for .16 and .08mm layer hights but suck at 0.2mm layer hights with that small of a nozzle
Given time I’m sure all of the defaults will get dialed in but for the time being (at least in my experience so far) the defaults for .2mm with a .4mm nozzle are pretty close and the default .08mm for a .2mm nozzle are decent as well with only minor tweaks to get better layer adhesion and quality
