@alankilian
Thanks again my friend... I found out that the ground wire was a bit short and I pulled it out from the ferrule of the connector...

many thanks all who put an imput. Its appreciated a lot. Have a nice weekend.

@Phaedrux
I wish to clarify some thing about my printer.
I have set the power to 1000. The Belts are not tight. Just tight enough.

just to indicate my level of understanding on the matter, I own and run a CNC machine shop with various Vertical machining and turning centers/eroders/wire cut machines, programming and servicing for around 35 years.

This printer is one of two prototypes I designed and manufactured and spent much time with it. I wish to maybe market in the future. It is made entirely of metal,

This particular 3D printer runs reciprocating ball slides in X,Y and Z and I am prototyping running X and Y with reciprocating ball 12mm bal-lscrews. It has water cooling, twin extruders, and fully enclosed. Running it with a Duet is certainly a fitting suitable option.

The motors have to rotate faster and more with the balls-crews but certainly much stronger.

Yes the heat bed is a bit heavy as it is made from a 6mm machined frame and the bed is around 400 x 400 mm with a 3 mm borosilicate glass.

The extruders are custom made with a 1:3 reduction gearbox- spent around a year developing them.

The bottom line...

Now when I home- if I home at F100, the homing is smooth. Even movement is smooth, however on increasing the feed, like F500, there is noise and the motors vibrate... If I increase the feed like F1000, the motors will simply vibrate and whine and do not move.

I am thinking of switching to 24V and maybe go for the nema x 60mm larger motors. I can`t easily switch to an other type as it will involve extensive modifciations.

many thanks for your feedback.

Coming to ,

managed to run the extruders now. Apparently, I edited the config as per suggestion on a forum.. don not know if it was this or any other honestly since I had found it days ago and screen shot it out, But the extruders are running nicely by command..

@dc42
you were absolutely right in this as the sensors were thermistors. The resistance was 118 Ohms. Thermocouples do not have any or infinity. I was really misguided. I connected everything and tested and the temperatures showing are actual off by 1-2 degrees.

My profound apologies for the din I created but I am sure I have learnt something else.
many thanks to everybody who lent a hand.

I have my printer with dual extruders...
I am performing trial prints to check if all is well but I am still encountering issues...

I have the following in Config;-

M591 D0 P6 C"e0stop" R1:600 E3 S1
M591 D1 P6 C"e1stop" R1:600 E3 S1

I am trying to print with Extruder 1

as soon as I try a print, I get an error that I do not have No Filament in extruder 0
I cancel and resume...

I get an error that I do not have filament in Extruder 1

My Question 1 ;- Why do I get an error connected with extruder 1 when I am working with extruder 0 ?

I put filament in the extruder 1 just enough to activate the filament present microswitch
the machine still pauses and tells me there is no filament in Extruder 0 again.
the error related to extruder 1 is not present any more. Looks like whether I am using extruder 0 or extruder 1, filament must be present in both extruders. Is this correct?

I try to print and still the machine does continue to bring the error for extruder 1...
Then I push the command;- M591 D0 P5 C"e0stop" R1:600 E3 S1 ( No filament present micro-switch) machine works.

This is sending me crazy... Can anybody suggest some tests i can do?

Note that when I switch on the machine, the LED flash correctly as described ....

@dc42
definitely, what I found out is that the filament present switch was not actuating 100%. The roller was not being pushed enough and the sensor was not receiving a signal. Alankilian confirmed that my config script was correct. When something crops up, we do not know if it is associated with the software, the hardware or the wiring and we would need to eliminate these one by one.

There is then the issue of the sensitivity of various different filaments. I use simplify 3d... and what I find good in Simplify 3d is the starting scripts.

My slicer profiles I have created them to suit different printers and I have them sub divided with different materials @dc42, I have not tried it yet but I think it makes sense that the commands are put in the starting scripts with different R values according to the sensitivity of material being used.

"M591 D0 P6 C"E0stop" R40:120 E3.0 S0
M591 D1 P6 C"E1stop" R40:120 E3.0 S0"

what do you think about this idea?

@alankilian
that is a magnetic type sensor.. What I will now check is the wiring to be 100% sure. That is my only trump card. I have a new sensor and will try it our and see. The laser is possibly working and it could be the wire sending the signals but for the two sensor wiring it is a bit far fetched....

@alankilian
Thanks for replying brother.
I have tried that... The switch functions very well I upload two photos so you can see. The switch is correctly wired- Common and Normally open (it will switch on when the filament is in place) You can also see where I soldered the wires.
What are the colors of your led's ? mine flash blue and green.. There is no red..

Uphill struggle with this project from start to end it seems

May I ask to confirm;- The S0/S1 enables/disables the microswitch function right?
if this is correct, what is very sure is that;

when S1 is enabled, the microswitch, released (no filament) or pressed (filament present) there is an error that there is no filament present and system sends the machine on pause. no printing can take place. The switch is not sending any signal. I checked the switch and I have them in both extruders and both behaving as such.
The switch is soldered to the board. I put the wire through the hole and soldered it. can`t think of anything.

The sensor is working as when I move the filament in it, the Blue LED blinks repeatedly.
the soldering looks ok to me...

@mendelevium
The instructions say....
*****On startup, after a few seconds the green LED on the filament monitor will flash 3 times if initialisation and self-test are successful. The green and red LEDs will then flash periodically indicating communication to the Duet. If the filament is moving, the green LED will flash more frequently.italicised text

looks like my board has a blue led and not a red led. On switching on the Blue Led will flash 3 times and then the green and Blue Led`s will flash as described then when filament moves the blue will flash more frequently.

Conclusion.
sensor initializing correctly but I have a
Blue Led instead of Green Led
Green Led instead of Red Led

@mendelevium

@mendelevium @mendelevium I am taking a look at everything..

Will try to give an accurate concise of what is happening

I mounted the pcb in a housing I designed, machined from Black POM with a 1.5mm end-mill and the filament passes through a 2mm hole so that the filament is positioned in a way so as not to play.

I have measured the distance from the face of the PCB (not the laser ) to the filament diameter and is 6.4mm. Is this correct?

I am also running 3+ firmware and the boards are V1.2

The switch is Normally open when no filament is present.

I have tried to put P as 5 but filament or no filament the machine starts.

I tested M591 D0 to test ;- it says no data received with filament physically present and tested again without filament and obtained the same response.

M591 D0
Duet3D laser filament monitor v1 on pin e0stop, enabled, allow 1% to 600%, check every 3.0mm, calibration factor 1.000, no data received!

Also the boards leds colors flash a green and blue in alternate fashion with stationery filament/No filament
When the filament is in movement, the green led does not flashes while the blue led flashes incessantly.

Conclusion;-
With S=1 and P=6 machine sends error that no filament is present when a job is started and is paused.
With S=0 machine starts up and proceeds
With S=1 and P=5 leds flash alternatively between blue and green, filament present or not present the leds remain like this but when moved the Green led stops flashing and the led starts blinking incessantly.
in this condition the machine will start with no errors.

I still cannot get this right. I have two laser monitors wired and with the following confiig.
I have filament in micro-switches wired as well.
M591 D0 P6 C"E0stop" R40:120 E3.0 S0
M591 D1 P6 C"E1stop" R40:120 E3.0 S0
The printer will run and the diodes flicker on the monitors.
however if I pull the filament present micro switch out, the printer will still run ( which means it will not sense if the filament is not present.

However if I change the S0 to S1, the machine will not start and give an error that filament is not present.
(the switch is pressed with filament present)
Printing paused no filament in Extruder 0
I cant get the hang out of it...

I have noticed my prints have excess extrusion at the corners of things. Does that have to do with the slicer or the pressure advance in the config settings

@mendelevium
I have reduced the jerk value considerably an have have obtained good results. IT is obvious that when the ratio of motor movement to axis movement is high as in the case of a ball-screw,the jerk is magnified. I have reduced the value of M566 from 900 to 120 and all the noise has vanished and there seems very little reduction in speed I have another tweak in the pipeline but will open a new post as it is not related exclusively to jerk issues