Edges curling when printing steep angle
I'm currently trying to print this dropship from Thunderhead Studio. Their models are designed to be supportless (or as supportless as possible) and generally speaking I've not had any issues till now.
Is tilting the object the only option for limiting the curling I'm seeing? It starts at about 2h 43m into the print job. The first two attempts were made using an off brand PLA (grey). I am now printing with Panchroma (Polymaker) black and it's doing better but still curling at the corners as shown below:
Here is the 3mf project file as well.
hextech_borealis_dropship_aftsection
The overhang tests that I've used al come out fairly well but I don't think they really test for the curling issue I'm seeing. I've tried lowering nozzle temps, leaving the top off, putting the print fan at 100% and so far I've minimized the curling but it's still there.
RE: Edges curling when printing steep angle
Usually what is required is a brim and/or mouse ears. First try a brim. Also, what build plate are you using? You may also need an adhesive but try a brim first.
RE: Edges curling when printing steep angle
Try turning Print Settings>Layers and Perimeters>Ensure Vertical Shell Thickness to either Partial or Off. The extra plastic it is causing to be laid down in that area will be heating that general location up, which will make it more difficult to cool and can lead to more curling.
You already have enough perimeters there to not have gaps so the extra isn't needed.
I'd also try a sample print of just that back slope with Dynamic overhang speed disabled. Just cut the model down to leave the back end with the slopes and test print that, will use less filament and time while you are working out the best settings for the print.