Hey all, do you have cooling fans pointed at your printed object? I’m having some curling issues (not with the first layers, mid-print). Printing PLA (no bed). Do I need more cooling, less cooling ? What is your experience with this ?
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I used to have a fan for prints. Now I don’t. I DO have a little issue with drafts/AC so maybe an enclosure around your printer might help.
@Shachar_Weis Ignore the spam comments.
PLA doesn’t usually curl much at all. Can you describe the curling and your setup?
Overall curling / pulling off bed?
Mass of part you’re having trouble with (large/small, % fill, etc.)?
Bed surface (tape, glass, etc.)?
Extrusion temp?
Using any fan now (describe)?
With PLA, mid print curling is usually caused by insufficient cooling. Does it happen more when you’re printing something that has a narrow horizontal cross section?
I think it happens most with overhangs. I’m now trying to print without the cooling fans at 195c.
I had similar issues with some cheap black PLA. Overhangs curled so bad the nozzle would knock the print off the bed! switched back to previously working stuff and it stopped happening! I do have a fan though.
Here is a pic of the culprit part and the printhead.
This was printed at 190c. Sadly, it doesn’t take much force to detach my magnetic print head. I need to rethink the 3-ball design, maybe switch to the classical 6-ball setup.
I’ve had curling problems on overhangs as well, even with fan running 100%. I lowered temperature by 5C and made sure the minimum layer time was 30-60 seconds. I think you need MORE cooling, not less. Maybe put a table fan on low aimed at printer?
BTW: That close-up photo is pretty good 3D printer porn!
@Carlton_Dodd what temp are you printing PLA ?
@Shachar_Weis It varies by color/supplier. I have some natural that likes 190-195C, and some ‘tuxedo black’ that prints best at 205C.
Your print looks like the right temperature. I think the PLA needs to be cooled very quickly for overhangs, especially if the print head comes back and re-heats the area too soon.
I think the problem is that the print head leaves the area and that spot is not cooled. What about placing a large stationary fan covering
the entire build plate ?
@Shachar_Weis Yep. That’s what I suggested a couple of posts back. 
That you did 
I missed the “more” button.
@Shachar_Weis I hope it works. Let us know.
I’m envious of your delta, by the way.
I had the exact same problem until I added a fan. I also tweaking the cooling time when I used slic3r. Haven’t printed anything with issues in kisslicer though
In spite of the curling your print quality is really good imho. I usually get curling when the area isn’t adequately cooled and especially when the hot end frequents the area repeatedly in a short period of time. I would like to second the large fan and also suggest you up your cooling delay for layers.