Best posts made by mendelevium

I have a duet wifi board and wish to get some advise about the best bed calibration. Currently have an adjustable precision aluminium plate heated with a 220V silicone pad with a glass plate. As the printer is fully encased, the manual adjustment is difficult to tweak. What is the best option (not necessarily the cheapest) Which is the best probe around easily adaptable to my duet wifi?

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

@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...

@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.

@dc42
took off that comment and the error vanished... thanks so much
the matter is closed..