Cooling fans

The effect of the cooling fans depend where the blow.

Cooling fans can cool the printed filament down to where it is enough stable to hold the next upper layer. On the other hand if an adjacent line connects better to the printed line if it is hot. Additionally the filament shrinks when cooling down and could pop off the heated bead. Slicers allow to control the fan depending the time the slice needs to print.

Cooling fans are also used on extruders to keep the filament to be printed on a low temperature to not get damaged when it runs over its hobbed bolt and reduce oozing when the filament gets retracted to make a position move without something to be printed.


Such colling fans might be permanently on since they do not depend on the slice shape.


Cooling fans might cool so well that the extruder does not reach anymore its temperature and the printer firmware as marlin report an error and stop printing.

Slicers as Slic3r have a parameter to set maximum fan speed.

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