Hi,
We’ve been running in to an issue where our H2D is printing extremely rough layers after a certain layer height. We have repeated the print 3 times and have gotten the same result each time. I haven’t found anything else on the forum specifically like this, maybe someone has had this issue as well and can offer some advice?
Some things we’ve noticed:
It seems to be happening after the support layers end.
Non linear (circle shaped) prints on the same tray were printing just fine.
Material is Elegoo PLA - Not calibrated, but we’ve printed countless prints that have turned out a-ok without calibration.
Things we have tried so far:
Cleaning and oiling the X & Y axis rods.
Replacing the nozzle.
Checking print head unit is sufficiently tightened.
Tweaking speed, wall printing order.
Any input is greatly appreciated, thanks!
Do you have fuzzy skin turned on, by any chance?
Otherwise, could you post your 3mf file for us to take a look at?
1 Like
Fuzzy skin is not on but I was joking that it looked like it was 
It was printing much too rough, the nozzle was hitting the previous layer and making a pretty bad noise, kinda looked like it was over extruding on that previous layer.
Here’s the 3MF file:
Mysterious Component.3mf (33.4 KB)
This looks like something heat related. I get almost the exact inverse when running ASA with too hot of a plate [bottom 1cm is all bubbly and nasty, as soon as its far enough away it behaves].
The 3mf shows it as Generic PLA @ 220C, which should be ok in general for PLA, and I use elegoo’s PLA+ at around the same temp without issue.
One thing to note is that the layer times change around a bit at around the same moment your bubbles arrive:: (slice, preview, layer time)
It still is not “THAT” fast - still like 12seconds per layer which should be alright especially for PLA. I dunno. You could do a “derp check” and just put two of them on the plate and hit go, it will essentially easily double the time per layer, doubling the time its allowed to sit and cool. But those bubbly bits seem like theyre being generated as its printing not some sort of warping as it cools. So im not sure layer time is an effective measure here. I’ll let someone with an H2 maybe chime in with something more relevant
Edit: it might also be interesting to try it out with Arachne wall generator - your thickness there is an odd-numbered multiple of your line width, so the Classic generator fills in that wall#5 as a “Gap infill”. Arachne will fatten those walls up to make only 4 walls but each is fatter, and loops [even] tend to work better with FDM.
Classic vs Arachne
1 Like
Update: I tried printing the part diagonally and it worked perfectly. I think this might mean I have to clean one of the axes better unless someone knows more than I do.
Appreciate the response, I’m hesitant to say its heat related because we’ve been running this filament at generic settings a lot without issue up until now.
That said, the previous print on the machine was a long petg print, but i’m not sure how that would affect things other than clogging a nozzle and I replaced the nozzle too (which I forgot to mention in the original post).
