problem with convex curling

[delta28770]

when ever i am printing a part weather it has overhangs or not the very edges of the print ( on the top layer ) curl upwards and i am printing in PLA. see here i am printing a standing man but his arms are curling way up above the extruder: https://www.dropbox.com/s/bwnj1a8laa...%2027%20PM.jpg and https://www.dropbox.com/s/8mgwhip69w...%2032%20PM.jpg

any help would be nice thanks!

[RedSox2013]

Not sure if this helps, but I found this on the reprap forum:

http://forums.reprap.org/read.php?262,117402,120058

Seems like there are several ways to try and avoid the curling.

[jimc]

i didnt read red's link but your part needs more cooling time. i always try to print things like this along with other things so the hot end doesnt stay in one place too long and gives a longer cooling time. if you dont have anything else then try printing a 2-3 outlind skirt the same # of layers as you model. it will do one later on the model then go around and print the skirt allowing the fan more time to cool the soft plastic.

[Sungod3000]

Yep had the same problem. More cooling helped, but i havent found a good way to cool from 360° and not cool the nozzle at the same time. I have printed a funnel but thats covering on ~180° so far

[Kingoddball]

You can just chain on another fan or two?
I had similar probs on my older printer, I just spliced on two more fans - Looks like crap, but helped with all of them issues.

There is a file on thingiverse which holds three fans and aims toward the print. - I can't find it right now but have seen it numerous times.

[Kingoddball]

This is the one I mentioned:

http://www.thingiverse.com/thing:198186 - This here would cool pretty much everywhere you're printing and its using large fans.