jsc wrote:With sufficient cooling on PLA, I can get up to 70 degrees with fairly decent results
There are two other things you can do to get the largest angle of overhang to print: One is to make sure you have perimeters printing from inside to outside, so that that outermost perimeter at least has something to grab onto on the inside edge, even if it doesn't have much support underneath. The other is to print with smaller layer heights. The smaller the layer height, the more support each layer has underneath. But that doesn't really get at one of the main causes of bad quality, which is that when you are printing on top of a very thin bit of plastic, it gets hot and starts warping (usually curling up) when the hot extruder is putting down more filament. Warping upward just makes the surface press harder into the nozzle on the next pass, so the problem just gets worse on each pass, and you have to be well past 45 degrees before the problem will start getting better.
