Trying to understand Fan Speed or is it a bug?

[winneymj13 0]

Hi,

I have been using the Cara slicer for a while and love it, but I have a strange problem now that I have a fan setup for cooling.

Iam using Cura 14.09, and in the Expert settings I have the following settings under the Cool Section:

Fan full on at Height: 0.6mm

Fan Speed Min: 50%

Fan Speed Max: 100%

Min Speed (mm/s): 10

Cool head lift: enabled.

My layer height is 0.2mm.

When I slice an object and look at the gcode here is what I see for the M106 (turn on fan) command(s):

 

;LAYER:1
M106 S63
..
..
;LAYER:2
M106 S127
..

and that is all. My setting says that at 0.6mm which is layer (2) the fan should be on full 100% (M106 S255).

Perhaps I am not understanding how the fan settings work. Please let me know.

Thanks

Mark

 

[Daid 304]

The min and max fan speed work together with the minimal layer time. When the minimal layer time is not yet reached then the minimal fan speed is used. (The idea being that smaller layers need more cooling and thus more fan speed)