This may have been going on for some time as the Anycubic which I'm using has the cooling fan hidden on the effector's back side. But I've just noticed that it's no longer responding to On/Off/Speed commands given it by S3D nor to my own adjustment via the LCD. I've been googling a while without success, any guesses here?
Thanks!

Edited 1 time(s). Last edit at 08/10/2017 06:17AM by papilio.

Tried another known_to_work fan?

Thank you for your reply. Yes I've tried several.

One thing I've come across while Googling the trouble though said that brushless fans are iffy as to whether or not they'll respond to PWM control (the writer claimed that they shouldn't work at all). No idea how much or little truth there may be in this, but all of the fans at my disposal are brushless.

Edited 1 time(s). Last edit at 08/14/2017 03:18AM by papilio.

Even if it doesn't like PWM, it should still run when you select maximum speed.

Perhaps the cable has failed, or the fan output on the controller board? Or have you uploaded new firmware, which perhaps wasn't configured correctly?

Edited 1 time(s). Last edit at 08/14/2017 05:32PM by dc42.

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Large delta printer [miscsolutions.wordpress.com], E3D tool changer, Robotdigg SCARA printer, Crane Quad and Ormerod

Disclosure: I design Duet electronics and work on RepRapFirmware, [duet3d.com].