Duet Wifi and BLTouch

ozi

So I have now updated to RFF3. I unplugged for the first installation the 2 z optical endstops and in the configuration tool I choosed Z-Probe as Z endstop at low and and configured the bltouch for the probe.

In config.g I made changes in M584 to get the second z motor working like:
M584 X0 Y1 Z2:4 E3

So now when I do homeall it is using the bltouch as my "z endstop" and both z motors are working.

Now as fcwilt described, its only a z probe but not ABL? I think I have now understanded it. Z Probe is not the same like Z home.

So homez calls the motor to home using endstop and G29 calls a probe definied with M558 P9 (for bltouch). I think i have it now and I dont need zmax and can use zmin.

I will try now and will report my progress

ozi

I give up..

Tryed everything what i can but it wont work use 2 endsop switches and the bltouch for probing.

I removed the jumpers and put the second z motor back from e1 to z2 again and will only use bltouch as probe and endstop.. maybe one day I will find someone who has time to explain and test it with me.

thank you all

fcwilt

@ozi said in Duet Wifi and BLTouch:

I give up..

Tryed everything what i can but it wont work use 2 endsop switches and the bltouch for probing.

I removed the jumpers and put the second z motor back from e1 to z2 again and will only use bltouch as probe and endstop.. maybe one day I will find someone who has time to explain and test it with me.

thank you all

When using end stop switches with ABL the z probe is only used AFTER to reset the Z=0 datum.

Recall that I have 3 Z steppers, each with their own end stop switch, for my bed.

Here is most of my homez.g file:

G91                  ; relative moves
G1 Z-399 F1200 H1    ; move up until endstop switch is activated
G1 Z20   F600        ; move down a bit
G1 Z-25  F300  H1    ; move up until endstop switch is activated
G92 Z10.200          ; set Z as needed to yield accurate Z = 1
G90	             ; absolute moves
G1 Z10 F1200         ; move nozzle to known position
G32                  ; invoke bed.g to level bed - pass 1
G32                  ; invoke bed.g to level bed - pass 2

Note that each Z stepper keeps moving until it's end stop switch is activated. Once all are activated the next step in the homing file takes place.

Frederick

ozi

I have tryed like your homez.g file and in config with M584 Z2:4, but had the following issue:
G91
G1 Z-305 F600 H1 -> Only the z motor connected on Z is moving the other one is not moving

Then I trigger the switch for Z and now BOTH motors going 20mm down (G1 Z20 F600) and then with G1 Z-25 F300 H1 the same only one motor is going up again.

And the same when I trigger the switch a second time BOTH motors are going down zo G90 Z10

I had M584 Z2:4 in config.g
I had M574 Z1 S1 P"zstop+e1stop"

but when z moving to Endstop (with H1) only one stepper is moving, when moving without H1 both are moving..

I dont now.. i give up

fcwilt

@ozi said in Duet Wifi and BLTouch:

G1 Z-305 F600 H1 -> Only the z motor connected on Z is moving the other one is not moving

That tells me that the end stop switch for the other stepper is already activated. Remember that with H1 the move stops when the end stop switch activates or is already activated.

Then I trigger the switch for Z and now BOTH motors going 20mm down

Triggering the switch completed the first G1 H1 move and then the G1 Z20 command was executed.

then with G1 Z-25 F300 H1 the same only one motor is going up again.

Again because the end stop switch for the other stepper is already activated.

And the same when I trigger the switch a second time BOTH motors are going down zo G90 Z10

Triggering the switch completed the second G1 H1 move and then the G1 Z20 command was executed.

Everything you see is consistent with the other end stop switch being activated at the start.

So find out why the other end stop switch is not working and your good to go.

Frederick

ozi

@fcwilt When the other switch was triggered then the red led from the optical switch should show it but it wasnt triggered.. maybe wiring issue..

I found another topic here:
https://forum.duet3d.com/topic/9684/bl-touch-and-two-endstop-switches/2

he wanted to make the same like I but no response from him if it worked...

there was a suggestion to use bed.g for leveling the bed and bltouch to probe..

I will try later more..

fcwilt

@ozi

Hi.

Homing the bed with multiple Z steppers/end stop sensors is a different issue from leveling the bed.

You can do both.

I think I mentioned that my printer has 3 Z steppers each with it's own end stop sensor.

If your end stop sensors are correctly position you can get your bed decently level.

To "fine tune" the leveling you use your Z probe and Automatic Bed Leveling (ABL - base command G32)

Can we get your homing working first?

Frederick

ozi

@fcwilt Oh my god.. I am the biggest idiot the last days here.. my god.. i feel really bad now

It was my false wiring.. i plugged the endstops to E0 and Z insted auf E1 and Z.. i am so sorry that i wasted your time. If you ever come to austria/vienna i will spend for some beer..

So now I can use homez.g and homeall.g to home both z steppers. And G29 to create a heightmap with the bltouch. I made a makro with G30 in the center of the bed to probe the center if i had do measure the z offset for the bltouch.. Soo now i am heating up my bed, will use homez.g get the z=0, then I will level manuelly with the screews and create a heightmap with bltouch to get it perfect

fcwilt

@ozi said in Duet Wifi and BLTouch:

austria/vienna i will spend for some beer..

That is weird that you should mention that.

My wife and I were chatting just day or two ago about places we would like to visit while we were still above ground.

As part of our research I used Google Earth to "visit" Vienna.

Frederick

ozi

@fcwilt vienna has a big history and a lot of sightseeing so just pm me if you ever come over