@fcwilt

Dear Frederick,

I think I found the problem. I did several test's.
At room temperature my z-offset = 0.95
My bed at 90 degrees celcius my z-offset = 1.27
My hotend at 250 degrees celcius my z-offset = 1.87

The pinda is just behind the hotend so the temperature is influencing the pinda probe up to 1 mm.

The other thing is even at room temp when I do automatic bed level the same point is getting a compensation of -0.1.

So my conclusion is. Temperature is influencing the probe to much. I tried the temp sensor of the pinda to get corrected for temp. But I don't find how it's calculated and how that algorithm works and if it solves my problem. I ordered a super pinda. Hope it solves the temp issue. I got a bl touch laying around so maybe give that one a try. I never imagine temp is influencing almost 1 mm.

@fcwilt ;
Axis Limits
M208 X0 Y0 Z0 S1 ; set axis minima
M208 X204 Y210 Z238 S0 ; set axis maxima

G31 P500 X0 Y-23 Z1.558 ; set Z probe trigger value, offset and trigger height

@danal thanks this was of great help also for my Duet3. I am a little visual minded so draw this to make it clear for me. Maybe of help to some others too.

@fcwilt

Frederick i think i add these lines. I have to check the C factor with the probe temp sensor. First without compenation and then with compensation and see what the result is.

;M308 S2 P"temp2" A"Pinda" Y"thermistor" T100000 B3950 ; temperature of PINDA2
;G31 P500 X0 Y-24 Z0.95 S21 H2 C0.02 ; C' (temperature coefficient of Z parameter in mm/°C, default zero

@fcwilt Thanks for your help

@fcwilt

Frederick,

This is the graph produced by the Z- probe thermistor and my measurements of the Z offset by G30 S-1 at specific temperatures. So 50 degrees is 1mm extra z-offset this makes the C in the G31 temperature coefficient of Z parameter in mm/°C 0.02 although it's not lineair.

I am adding in config.g:
M308 S2 P"temp2" A"Pinda" Y"thermistor" T100000 B3950 ; temperature of PINDA2
G31 P500 X0 Y-24 Z0.95 S21 H2 C0.02 ; C' (temperature coefficient of Z parameter in mm/°C, default zero

Tried this but it's not leading to higher the trigger distance when the probe is 50 degrees hotter. So this is not working. My superpinda just arrived wich seems to be temperature resistent. Let's try because this is not leading to consistent z-offset in my case.

I changed in config.g the C to T because of Firmware 3.3 in my machine and now it's working:
M308 S2 P"temp2" A"Pinda" Y"thermistor" T100000 B3950 ; temperature of PINDA2
G31 P500 X0 Y-24 Z0.95 S21 H2 T0.02 ; T' (temperature coefficient of Z parameter in mm/°C, default zero

Still going to test the superpinda, see if it works better without compensation.

A little status update from my part. Today I installed the superPinda probe. This probe has no need for temperature compensation like the Pinda V2. It works great and keeps logic more simple to calculate the Z-offsets. Also there is less difference when I probe again and again. So I can advise this superPinda also sold as upgrade from Prusa. You can buy it better from them because it's much cheaper as the orginal manufacturer price from Pepperl-fuchs (superPINDA)
Inductive sensor NBN2,5-8GM35-E1L-Y. I attached the datasheet if anyone is interested. It's rated till 80degrees celcius. I heated it till 110 with no deviation.

Brown is 5V
Blue is GND
Black is signal

An easy drop in to one of the endstop io's when you remove the wings from the connector.

SuperPrinda-datasheet_70134664_eng.pdf

In noticed even deviation of 1.04 mm at 80 degrees celcius.

@anagh I see they are 12V so I don't know if the switching power is also 12V. I don't assume that. Do you feed them with 12 volt to the coil? You can try to use the GPIO for signal. Should work. You can test it with an external power supply or buck.

From the info it should work because you put it also low.

1. DC +: 12V positive power supply
2. DC-: negative power connection
3. IN1-IN8: each way based on the settings , can be high or low to control the corresponding relay

@anagh Maybe this is helpfull to you. I control a relay with a power module. https://forum.duet3d.com/topic/26396/connecting-lerdge-power-monitoring-module-did-i-do-well?_=1639784083332

Normal open en normal close are how they respond to signal.

@oliof I was speaking in general not in relation to your remark VINDA. So I didn't try to correct you. I was just mention my recent experience with Pinda V2. Have a great day.

@oliof You got the pindaV2 and superPinda. In China they sell the V2 and you can get confused. If you order the pinda from Prusa you get the superPinda correct.

It did work but I noticed io3.out got influenced by my superPinda. This prope is connected to io3.in. When it probes io3.out is influenced and my power was shortly cut off. I put everything on the free io0 and used io0.out for the power module. Now it's working fine.

@thedragonlord I would suggest buying the superPinda. It needs no temperature compensation. For the Pinda V2 the Z-offset needs to be compensated for temperature if you print higher temp.

Don't forget your metal sheet when doing home. The probe needs metal to stop. Your hotend will push itself on to the bed.

You can read some here https://forum.duet3d.com/topic/26298/hidden-z-offset-duet3?_=1639652131487

As earlier mentioned, I think you have to rule out some things:
Is your x motor your x motor. (sending gcode)
Is your y motor your y motor. (sending gcode)
Does they rotate in the correct way. (sending gcode)
Does x home before y?
Read your gcode in another slicer (or gcode viewer) and see the result.

From there you can troubleshoot. Looks to me you changed x and y.

At first I connected my Lerdge connecting power Monitoring module and button to PSON to my Duet3. One disadvantage is when resetting or emergency stop I needed to walk to my printer and put it on manualy.

So I thought about other wirering to the Duet3 board and came up with this idea. I tested it and it is working.

Define io3 with M950 command and I can switch it of with M42 P3 S1 or put this at the end of my GCode to turn the printer off. With a reset the printer stays on and at start I don't have to wait untill config.g with M80 is initialized.

Is this the way to to so or are there other ways or remarks?

@fcwilt Frederick, thank you great site.

A little status update from my part. Today I installed the superPinda probe. This probe has no need for temperature compensation like the Pinda V2. It works great and keeps logic more simple to calculate the Z-offsets. Also there is less difference when I probe again and again. So I can advise this superPinda also sold as upgrade from Prusa. You can buy it better from them because it's much cheaper as the orginal manufacturer price from Pepperl-fuchs (superPINDA)
Inductive sensor NBN2,5-8GM35-E1L-Y. I attached the datasheet if anyone is interested. It's rated till 80degrees celcius. I heated it till 110 with no deviation.

Brown is 5V
Blue is GND
Black is signal

An easy drop in to one of the endstop io's when you remove the wings from the connector.

SuperPrinda-datasheet_70134664_eng.pdf

In noticed even deviation of 1.04 mm at 80 degrees celcius.