Typically you'll set this to a higher value compared to normal printing. Overrides the fan speed with set value when printing bridges and overhangs. Try changing the values and see how the description changes. This may seem a bit confusing, but you can use the live-updating text description above Fan settings, which will hopefully make everything clear. If the layer print time is between these two values, the fan speed will run proportionally at a speed between the Min and Max value. The Min value will be used when the layer print time is longer than Enable fan if layer print time is below value. The Max value will be used when the layer print time is below the Slow down if layer print time is below value. ![]() You can set Min and Max fan speed as a percentage of the fan's max RPM. When disabled, the print fan will run at a fixed speed the whole time defined by Fan speed - Min with the exception of bridges, which can still be defined by Bridges fan speed. A text description below will update with every change of any cooling setting and will explain in detail the resulting cooling behavior. When enabled, the cooling fan and print speed will change during the print based on the settings below. This setting is typically on for most materials with the exception of ABS, PC and some flexibles. The print fan will always maintain at least a minimum speed. PrusaSlicer lets you adjust the cooling settings for each filament. However, with some materials, this could make things actually worse and cause warping or layer separation. By blasting ambient air at the extruded filament, the cooling can be dramatically improved. Most 3D printers come with a dedicated print fan. When printing overhangs or bridges, it's important to freeze and solidify the plastic in place as soon as possible. ![]() Printing must always be done on an already solidified layer, otherwise, the previously extruded plastic will be moved around and distorted by the new layer. ![]() As soon as the melted plastic leaves the nozzle, it's no longer under the precise control of the extrusion system.
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