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Were you able to print the fan blades without support on the MK2S? They look like they should be fine, but Slic3r keeps adding support despite my threshold being at 80 degrees. Just curious whether I should follow my intuition or let Slic3r do its thing.
EDIT: I just found the Fan_with_supports file and it confirms my suspicion. The blades should print nicely at .1mm without additional support. Sorry for bothering you!