Servo deployed probe on Duet Maestro

Blacksheep99

@Veti said in Servo deployed probe on Duet Maestro:

i am using this

https://www.thingiverse.com/thing:3303618

and it works on the maestro.

all the connections are going to the z probe header.

gnd is combined and 5v is combined in this case.

So I've ditched my old probe and made one of these today. I've connected it up and it seems to be working as it should. I just can't get my head around what I need to get this to work with my printer. By that I mean bring the bed up, probe deploy and then bed probed.

I'd appreciate some guidance, just to help my understanding.

Veti

@Blacksheep99

its pretty close to bltouch. just select P8 instead of p9.

same retract and deploy scripts (might have to adjust the angles slightly)
although you need to add a M401 if you want to deploy it before and M402 when you want to retract.

example homeall

; homeall.g
; called to home all axes
;
; generated by RepRapFirmware Configuration Tool v3.2.0 on Fri Jan 01 2021 18:39:48 GMT+0100 (Central European Standard Time)
G91                     ; relative positioning
G1 H2 Z5 F6000          ; lift Z relative to current position
G1 H1 X-240 Y-240 F3000 ; move quickly to X and Y axis endstops and stop there (first pass)
G1 H2 X5 Y5 F6000       ; go back a few mm
G1 H1 X-240 Y-240 F240  ; move slowly to X and Y axis endstops once more (second pass)
G90                     ; absolute positioning
G1 X10 Y10 F6000        ; go to first bed probe point and home Z
M401
G30                     ; home Z by probing the bed
M402

; Uncomment the following lines to lift Z after probing
;G91                    ; relative positioning
;G1 Z5 F100             ; lift Z relative to current position
;G90                    ; absolute positioning

Blacksheep99

@Veti Thanks, I'll give this a try when I finish work. What about my config.g file? or does this replace what's currently in there?

Blacksheep99

@Veti said in Servo deployed probe on Duet Maestro:

@Blacksheep99

its pretty close to bltouch. just select P8 instead of p9.

same retract and deploy scripts (might have to adjust the angles slightly)
although you need to add a M401 if you want to deploy it before and M402 when you want to retract.

example homeall

; homeall.g
; called to home all axes
;
; generated by RepRapFirmware Configuration Tool v3.2.0 on Fri Jan 01 2021 18:39:48 GMT+0100 (Central European Standard Time)
G91                     ; relative positioning
G1 H2 Z5 F6000          ; lift Z relative to current position
G1 H1 X-240 Y-240 F3000 ; move quickly to X and Y axis endstops and stop there (first pass)
G1 H2 X5 Y5 F6000       ; go back a few mm
G1 H1 X-240 Y-240 F240  ; move slowly to X and Y axis endstops once more (second pass)
G90                     ; absolute positioning
G1 X10 Y10 F6000        ; go to first bed probe point and home Z
M401
G30                     ; home Z by probing the bed
M402

; Uncomment the following lines to lift Z after probing
;G91                    ; relative positioning
;G1 Z5 F100             ; lift Z relative to current position
;G90                    ; absolute positioning

So taking your example I modified my home all to try this. I changed the X and X to my bed size. Sending just the M401 command deploys the probe fine, the M402 retracts it.

This is my config.g code.

M574 Z1 S1 ; Set endstops controlled by probe
M950 S0 C"^zprobe.mod" ; create servo pin 0 for BLTouch
M558 P8 C"^!zprobe.in" H2 F900 T6000 ; Set Z probe type to switch and the dive height + speeds
G31 P50 X50 Y-8 Z2.43 ; Set Z probe trigger value, offset and trigger height

When I home all the head moves out as expected, the bed starts to raise, probe deploys and the immediately retracts and the z stops.

My probe in the dashboard shows 0 when retracted and 1000 when deployed. Is the inverted pin causing an issue?

Blacksheep99

This is the bed and head setup. Excuse the chaos behind it!

Phaedrux

@Blacksheep99 said in Servo deployed probe on Duet Maestro:

Is the inverted pin causing an issue?

Could be. Your description makes it sound like it assumes that it's triggered as soon as it deploys? Correct?

dc42

@Blacksheep99 said in Servo deployed probe on Duet Maestro:

My probe in the dashboard shows 0 when retracted and 1000 when deployed. Is the inverted pin causing an issue?

What happens if you don't invert the pin? Does probing work then?

Veti

@Blacksheep99 said in Servo deployed probe on Duet Maestro:

My probe in the dashboard shows 0 when retracted and 1000 when deployed. Is the inverted pin causing an issue?

yes it needs to be inverted

change to C"^zprobe.in"

Blacksheep99

@Veti said in Servo deployed probe on Duet Maestro:

@Blacksheep99 said in Servo deployed probe on Duet Maestro:

My probe in the dashboard shows 0 when retracted and 1000 when deployed. Is the inverted pin causing an issue?

yes it needs to be inverted

change to C"^zprobe.in"

Ok, I've changed this. The probe itself is off the bed. Do I need to add a move command for X and Y to move the head over the bed?

I current have the mesh compensation commented out in the config.g not sure if that should be active?

Blacksheep99

Probe now shows 1000 when retracted.

To test the probe is working I moved X and Y over the bed and tried to run G30. It doesn't run as it says probe is already deployed.

Phaedrux

@Blacksheep99 said in Servo deployed probe on Duet Maestro:

Do I need to add a move command for X and Y to move the head over the bed?

yes.

@Blacksheep99 said in Servo deployed probe on Duet Maestro:

I current have the mesh compensation commented out in the config.g not sure if that should be active?

what exactly do you have commented out?

Phaedrux

@Blacksheep99 said in Servo deployed probe on Duet Maestro:

it says probe is already deployed.

In your homing files you may want to add a M401 at the start to ensure that the probe is retracted and so that the firmware is aware it's retracted.

Then try again.

Blacksheep99

@Phaedrux said in Servo deployed probe on Duet Maestro:

what exactly do you have commented out?

;M557 X15:265 Y15:135 S20                        ; define mesh grid

Phaedrux

Yes you should uncomment that line out. It tells the firmware where to probe when doing a G29.

Blacksheep99

@Phaedrux said in Servo deployed probe on Duet Maestro:

@Blacksheep99 said in Servo deployed probe on Duet Maestro:

it says probe is already deployed.

In your homing files you may want to add a M401 at the start to ensure that the probe is retracted and so that the firmware is aware it's retracted.

Then try again.

Do you mean M402?

Blacksheep99

@Phaedrux Thanks. Will do

Phaedrux

@Blacksheep99 said in Servo deployed probe on Duet Maestro:

Do you mean M402?

Yes, sorry. Retract the probe.

Blacksheep99

@Phaedrux said in Servo deployed probe on Duet Maestro:

@Blacksheep99 said in Servo deployed probe on Duet Maestro:

Do you mean M402?

Yes, sorry. Retract the probe.

Thanks, shows I'm paying attention if just a bit! ha

Blacksheep99

So I've got the probe showing '0' when retracted. I position the probe over the bed and run G30. The probe immediately deploys and the bed starts moving towards the print heads.

Following this guide: https://duet3d.dozuki.com/Wiki/Test_and_calibrate_the_Z_probe

I press the Z probe up expecting the bed to stop but it continues leaving me to use emergency stop to kill things. What have I got wrong?

Phaedrux

please share your current probe config and refresh me on your wiring.