Ian
I have wired up as discussed but the fans don't run when tested. I think my logic must be wrong.

@droftarts one is a
Noctua the other is a blurolls. I will set them up as you have advised this evening. The next step is to programme them that will no doubt challenge me a bit more. . Many thanks for your help. Regards John.

@droftarts two at 0.1amp. The fans have 3 wires pos neg and signal I assume I use gnd voutc1 and the bottom pin.

@droftarts Thanks Ian I think I've got it. I will remove the jumper and connect the centre pin of 5v PWM to centre pin of low current output voltage select for out 3 and 4. Regards John

@oliof Thanks for your help. The guide says "You can supply a different voltage to the centre pin of the 3-pin jumper, pin VOUTLCx, to run fans at different voltages". This is the bit I am having difficulty with. How do I do this.

Can anyone advise me how to connect 5v pwm 3 wire fans to a duet mini please.

@johnmaundrell Ahh I was thinking probe offset was only XY not Z as well!!!

@johnmaundrell I have to go out now but I will try again this evening thanks everyone so far for your help. I will gradually get a better understanding with your help. G31 is a good start.

@johnmaundrell M564 S0 dosent disable the axis position

@jay_s_uk I have tried this set up but it appears that after I set it all up it fails to save the data and then reverts back to the original setting. I can also only set it up in the homed position not in the centre of the bed.