The option to use the fan above x height in Cura seems to be flaky, sometimes it works and sometimes not. Is there somec algorithm that controls this overvand above my input settings?
Les
Not sure what the problem would be, as I have never had any issues with it.
- Make sure you have the “Enable Cooling Fan” box checked.
- On the Cool dialog, enter the height and min/max values.
- A value less than ~28% will NOT spin up the fan. I suggest using 30% or greater for min/max values.
- When making ANY change to settings, if you have the Print Control window open – you MUST close and re-open the Print Control window or the changes will not be incorporated into the gcode.
Other than that, it should work. You can use Cura’s “File, Save Gcode” to save the sliced file, then view it with a text editor – and search for M106 commands to see where Cura added them. If there are M106 commands (with values >77, which represents 30%) and the fan still isn’t coming on, then I would start to suspect some kind of hardware issue.
I was unaware of the need to close and reopen the control window, that probably is the reason why
Cheers
Les
That one bites a lot of people… me included. 
I wish there were some kind of warning or reminder when making changes while the print window is open!