Problem printer angles up

Unsure how to explain this but when I'm printing upward angles the prints aren't very good, I guess think of a triangle point down and trying to print it, the print would come out bad, yet turn the triangle around so the long side in on the bed and it prints fine. The reason I'm asking is that in the current project I can't rearrange the printing and I don't want to use glue as the part needs to be strong. I think the picture should show the problem. Any tips would be great.

Printing PLA 3mm
nozzle .4mm
Layers .2
Bed about 70%
Fan always on
Speed about 30 (using Slic3r auto cooling)

That is caused from your previous layer staying warm too long. It's curling up and your nozzle is rubbing against it. Use a cooling fan on your object and slowing down the print speed may help. Or try printing with support enabled.

Edited 1 time(s). Last edit at 02/08/2014 07:17PM by KingRahl.

Thanks KingRanl, normally I would be saying the same but in this case I don't think it is the bottom layer being too hot and added some pictures of another test to show no curling. It is almost line the head pulls the PLA back after each stroke or the PLA being extruded cures up towards the head a little at the end of stroke so doesn't fully finish it.

Here is the STL of the bridge if you want to see what your printer does.

You need to use support for the overhangs like that. You can't just extrude plastic mid air and not expect there to be some globs drooping off it. All slicers (that I know of) have a support option.

In the first picture, your angle is waaaaaay more extreme than that over hang test. And in the overhang test picture, the volume of each layer is smaller. The problem of it curling is when has a chance to cool ever so slightly. Also you have 2 facing each other. This left your final direction leading away from angle. The curling mostly occurs when you head in the opposite direction.

Cheers, I don't understand "The curling mostly occurs when you head in the opposite direction." what is the opposite direction e.g left to right

If the angle is heading to the right like in your first picture, that is where the curl will occur. When your print head moves across that perimeter in the opposite direction (left) your print head or any ooze bane can touch that thin layer and pull it in that direction. Effectively causing an ugly print.