Just slide the fan slider on the Machine Control Panel. It will add the commands to the data stream. (You can confirm this by monitoring the communication tab with "Verbose" checked.) Note that if you are in the midst of some other command (like waiting for the bed to reach temperature, waiting for some buffered long moves to take place, etc.), the fan speed change commands will be processed "later". May not look like it got sent, but eventually the serial buffer will be processed and you'll see the fan speed change.
MrWayne wrote:Hi There...
Can I please confirm if it is possible to turn on the cooling fan (M126) via the Control Panel, similar to turning on the Heat Bed..???