@jay_s_uk
Oh wow that worked, I can't thank you enough.
I was on a tight deadline for getting this to work.

Also I got it working just fine but now all of a sudden both drives have stopped working.
Got some very nice prints out of it

@dc42 The chamber and the cooling fans are 5 very large blower fans, could the temperature change when opening the door be explained by a lower pressure in the chamber causing the fans to spin faster and creating more interference?

@rjenkinsgb
That must be it, the whole wire is rated thermocouple wire until the last 50cm. My boss wired this machine and had no idea this was a thing with thermocouples, thanks for the reply this has finally convinced him to switch over to regular thermistors.

@dc42 This uis the only part that is vissible without taking the machine further apart. The wires go through the cooling duct to the printhead (this is the original desing of the stratasys) The red light is from the config because I've turned that one off.

@dc42 Just double checked the wiring and all seems to be in order. I truly wish I could convince my boss to just use some glass bead thermisters on the hotends because those would fit just fine.

@dc42 Nothing changes when motors are on or off when It does go down it goes down slowly as the chamber heats up. When this happens onlt the heaters for the chamber are on.

@verminsup No it is reading in the correct direction. When I increase the nozzle temperature the reading also increases. I just have no way of knowing when it's hot if the temp is correct or even stable

I'm using three old J type thermocuples in my Stratasys Sst 768 duet conversion using two Thermocouple daughterboards. These are the weird things I've seen:

1. When the chamber is heating up the two temperatures on the first board go down to between 1c and -3c.
2. When I open the door the temperature rises on the two temps under 0
3. Using a seperate temperature sensor the room temp is correct, this thermocouple is on the second stacked board while the extruder thermocouples are on the first
4. When I switch boards the temperature fluctuations stay the same and the chamber temp stays the same
5. After removing the board I noticed a weird almost wet patch on the board
   and one of the components was soldered in a bad way. (pics)

Any way to fix this or is this board just bad?

Config for the extruders (don't mind the weird chamber PID)
M308 S0 P"spi.cs0" Y"thermocouple-max31856" T"J" ; configure sensor 2 as thermocouple via CS pin spi.cs2
M950 H0 C"out1" T2 ; create chamber heater output on out0 and map it to sensor 0
M307 H0 A11 C99000 D2000 B1 ; Pid Tune heater 2
M140 H0 ; map chamber to heater 2
M143 H0 S100 ; set temperature limit for heater 2 to 100C
M570 H0 T15 S20000 ; Heater fault detection heater 2, 20000 seconds and 15c difference

M308 S1 P"spi.cs2" Y"thermocouple-max31856" T"J" A"Support" ; configure sensor 0 as thermocouple via CS pin spi.cs0
M950 H1 C"out2" T0 ; create nozzle heater output on out2 and map it to sensor 0
M307 H1 B0 R5.606 C78.0:75.6 D4.59 S1.00 V24.1 ; Pid tune heater 0
M143 H1 S350 ; set temperature limit for heater 1 to 350C
M570 H1 S10 T20 ; Heater fault detection heater 0, 10 seconds and 20c difference

M308 S2 P"spi.cs1" Y"thermocouple-max31856" T"J" A"Material" ; configure sensor 1 as thermocouple via CS pin spi.cs1
M950 H2 C"out3" T1 ; create nozzle heater output on out3 and map it to sensor 1
M307 H2 B0 R5.483 C90.7:90.7 D4.79 S1.00 V24.1 ; Pid Tune heater 1
M143 H2 S350 ; set temperature limit for heater 2 to 350C
M570 H2 S10 T20 ; Heater fault detection heater 0, 10 seconds and 20c difference

Also I got it working just fine but now all of a sudden both drives have stopped working.
Got some very nice prints out of it

@alankilian
I'm not sure how I can give a specific extrusion amount
By having someone stubborn above me

@o_lampe
I have found this driver.

But I'm still not sure how I'm going to let the duet extrude a specific amount.

I'll check that driver