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turning off part cooling fan

Posted by vfwfw 
turning off part cooling fan
September 09, 2017 05:34AM
I have recently built a prusa i3 clone and am just starting to print in abs. The issue I have is that in Slic3r I am turning the fan off, however at certain points in the print, the fan comes on at 100% and is actually cooling the hotend down to a point where the print is killed due to thermal runaway.

How do I ensure the part cooling fan does not come on at all....apart from actually unplugging it?
Re: turning off part cooling fan
September 09, 2017 07:48AM
This is settings in your slicer... which you haven't mentioned
Re: turning off part cooling fan
September 09, 2017 08:04AM
Quote
Dust
This is settings in your slicer... which you haven't mentioned

I thought I had turned the fan off in the slicer, in the Filament Settings tab. I unchecked both options in the Enable dialog box and it says that the fan will be turned off, but when I print, if there's a layer where there is bridging (usually just after an infill layer) then the fan comes on 100%.
Re: turning off part cooling fan
September 09, 2017 08:55PM
I don't know if this issue is the cause, but I have attached photos of the print I am having trouble with the fan coming on.

Or would not having the printer in an enclosure be the issue?
Attachments:
open | download - IMG_1207.JPG (107.8 KB)
open | download - IMG_1208.JPG (117.4 KB)
open | download - IMG_1209.JPG (112.2 KB)
Re: turning off part cooling fan
September 10, 2017 12:06AM
That is just ABS without an enclosure. I run my fan when printing ABS in my Qidi without any issues. But, it is fully sealed.
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