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PLA curling on one side only

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Hi all, I am currently printing out some of the 'arrows' from https://www.thingiverse.com/thing:2020668 for my son.

I have found this particular PLA filament to be very susceptible to overhangs curling up and have been adjusting settings in Cura and on my Ultimaker 2+ to minimize them as much as possible.

This print is interesting as the curling is only happing on one of the three 'prongs' of the arrowhead, but it is the same one on each arrowhead - the right rear prong (see pics). The other two on each arrow are printing without the curling.

Any ideas why this would be printing like this - fan placement and airflow on the print head? And any help to further minimize the curling would be appreciated.

Printing at 195 / 45mm/s (or slower) / random z seam



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Try printing as cool as possible. Also, try putting a table fan in front of the printer, after it has printed the first two layers (do these without fan for good bed adhesion). I found these things help, although they do not totally solve the issue.

But too much cooling might cause temp errors, if the bed- and nozzle heater can not keep up with the loss.

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I have been playing with different strategies for dealing with general curling such as extra fans and speed/temp etc. This one print just surprised me at first as it was just the one out of the three overhangs that was curling - the other two were doing OK with my adjusted settings. I think it is just the placement of that one overhang and the fact it is in a bad position relative to the print head fan outlets - the airflow from the fans is not as direct as on the other two prongs due to the width of the print head and the nozzle being on the left side.

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