SeeMeCNC Rostock MAX v2 Assembly Manual page 255

Before you attach the fan & mount, you should test it first to make sure the wiring is correct and
that the squirrel cage moves freely.
Start up Repetier-Host and power up your Rostock MAX v2 and connect to it. Right below the
Print Bed controls on the right side of the Manual Control tab, you'll see a fan control:
Fig. 24-9: Fan control.
With the installation of the layer
fan, your Rostock MAX v2 is totally
complete!
Rostock MAX v2 Assembly Guide
Move the slider to the right so the Output field reads 100% and
then click the Fan button. The layer fan should come on. If it
doesn't, check your wiring and make sure the squirrel cage is not
binding against the fan shroud. Once you've got the fan working,
use a #4, 3/8" screw to install it.
Fig. 24-10: Layer fan installed!
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