Issue identified. The other two z motors are mounted with an aluminium plate. The third one that gets really hot is mounted using a printed part. Clearly the heat of the other two is been transferred onto the alu plate.
I proped a alu piece against the third motor, and it remained as cool as the other two.
Learn something new every day 
You can, if you mean as a z-endstop. I use it on my CoreXY. Works quite well. Its just an inductive sensor. You don't connect the temperature wire as you would on a Prusa. I believe that may be supported in RRF3 if I remember correctly.
Can send you a photo of the wiring when I get home, and config 
Issue identified. The other two z motors are mounted with an aluminium plate. The third one that gets really hot is mounted using a printed part. Clearly the heat of the other two is been transferred onto the alu plate.
I proped a alu piece against the third motor, and it remained as cool as the other two.
Learn something new every day
@bearer
Fair point.
The chinese branding things as Duet, without disclaiming that it is a clone / fake. And they will use the cheapest crap components possible. But as you said, that doesn't eliminate the user error.
@ViralTinker said in DuetWifi clones and support:
What an offence seriously?!?!? Rich people can afford Without thinking, middle level buys what affordable and homeless has nothing to loose....
OK
I suppose its more targeted at the hardware side of things. Seeing some of these clone boards melt down and then people assuming it was an original Duet board is where things get sketchy, but clearly not something that is easily resolved due to the chinese way of doing things as cheap as possible.
Hi
I read somewhere that it will be supported in RRF3 but for RRF2, best leave the temp sensor disconnected.
@Danal Must be another "inztigator" as I did not register today 
My post was not meant to get anyone to wind up their undergarments I was curious what others thought about it. I just find it annoying at the number of posts on Facebook where a clone Duet has been used and the Duet name is thrown around like it was the cause of the cheap components usually found on these boards.
Bye, now!
Hey All,
I browse these forums often as they not only help in troubleshooting any issues, there is also a wealth of general information here.
Now my question is regarding the Duet Wifi clones out there..
Should owners of these clones be allowed to interact on the official Duet3d forums? From my personal opinion, I say, HELL NO!! We pay a premium for a premium product, and with that comes premium support.
Your thoughts?
Maybe we need to add validation to the forums, so that you need to link your account to a board serial number
So, checked resistance of all three Z motors. All within 2.0 and 2.2 Ohms, well within the 2.1Ohm spec (+-10%) per E3D's motor spec sheet.
I moved the Z motors from drivers 5,6,7 on the Deux5 to 7,8,9. Same motor still super hot. Its the centre Z motor which has two linear rods on either side, and I am suspecting maybe there is a misalignment or too much friction that is causing the motor to heat up.
Will continue investigating - I suspect it maybe mechanical.
Thanks for the tips though