I agree this is very important also and would like to see this feature added. I would also like to add yet a further nuance regarding feed rate which is that the lower limit is just as important as the upper limit. Most people seem to be focused on how fast they can extrude, but when printing small ...

Nevermind. Just learned how to change firmware configuration options and I removed the PWM modifier, fan works ok now and turns on automatically. I would think this is the solution for everyone else. Tools/Frimware configuration "FFF" tab, change "set fan power" option to just "M126" This is softwar...

I have this problem with my Rep 2x (cooling fan never turns on), but when I check the g-code it has "M126 S255". It seems like this is whats expected but I didn't think that the cooling fan was capable of PWM. In other slicers, the command generated is simply M126 with no other modifier (which works...