just a note..

If you solder on wire going to a screw connector the mechanical pressure will compress the solder overtime. and will eventually get loose..
better go with crimped and then solder (solder the wiren in the crimp) or pure wire

@pro3d
I add code to my slicer Simplify 3d
to start the ATX power supply

my code in Start scripts
M80; Start ATX
G4 S5 ;Yield 5 sec before continue
M104 S[extruder0_temperature] ;Preheat Extruder
M190 S[bed0_temperature] ;Wait for bed to heat
M140 S[extruder0_temperature] ;Wait for Extruder

I should properly not use the M104 command but its fine..
heats up the nose but I will properly move it to after

The Myyy[xxxxxX_xxxxxxx] tells simplify3D to ignore its own inserted commands.
so it will not insert them before you start scripts

@dc42 hI thanks for the reply and the clarification

Hi Again found the solution for a
Simplify3d

in my start Code I insert
M80; Start ATX
G4 S5 ;Yield 5 sec before continue
M104 S[extruder0_temperature] ;Preheat Extruder
M190 S[bed0_temperature] ;Wait for bed to heat
M140 S[extruder0_temperature] ;Wait for Extruder

the build in M140 and M109 will be overriden and the variables replaced on build 🥰

thanks anyways..

Hi all I know that this questions have been asked before,
but I did not find the solution..

https://forum.duet3d.com/topic/7828/problem-with-powering-on-with-m80

My machine:
Modified CR10S with the Duet3D wi-fi board. Firmware version 1.21 (2018-03-21)
and a 500W ATX PowerSupply
(The powersupply is hooked up the the EXT 5V
(and jumper moved to allow for power on/off)
(Using Purple Green and black from the ATX powersupply)
so its always delivers 5V power and Pulles the ATX green wire low to power on...)

I want the M80 command to be run before the print starts..
my slicer produces this...

// slicer Inserted before print
G90
M82
M106 S0
M140 S74
M190 S74
M104 S195 T0
M109 S195 T0
// My start G-code.
M80; PowerON ATX
//as dek pointed out I would properly need to yield for some time for the stepper to power up.
SO I will insert the G4 S5 ; Dwell for 5 seconds

as I understand it, the M104 and M109 is yielding for heated nossel and bed.
Stopping the ATX power from turning on..

Dc42 pointed out the the post that there a start.g file but my understanding is that the start.g is initialised from sd card prints, and im using the Webinterface