Another BL touch config question: Y-offset this time

Phaedrux

The part cooling fan is typically on the Fan0 header and the hotend fan is on Fan1. This is because slicers typically don't send commands that target a specific fan, they just send M106 S1 to turn the first fan on or off. You can get around that by using the tool definition to to assign a different fan as the tool fan, so it's not critical.

The hotend fan is Fan1 because the firmware will start that fan spinning briefly at power on just incase the printer lost power or was reset when the hotend was hot to help prevent jams from heat creep.

The BLTouch should be using P9. That's the probe mode specifically made for the BLTouch. It helps the firmware control the deploy and retract of the pin and a few other tweaks. Is the BLTouch a clone or a really old version or something? What exactly didn't work with P9? How do you have it wired up? Is it wired to the Z probe in pin or an endstop?

The BLtouch works best with a slow probe speed. You can use a double probing technique in your homeall to use a fast probe first to get it to the bed, and then a slower one second for better accuracy. Like this:

M558 A1 F400			; Set single probing at faster feed rate
G30 				; Do a single probe to home our Z axis
M558 A10 F100			; Set multi probing at slower feed rate
G30				; Probe again to get a more accurate position

The G31 probe offsets should be measured like this: https://duet3d.dozuki.com/Wiki/Test_and_calibrate_the_Z_probe#Section_Measuring_Probe_X_Y_Offset

Don't use M206. Not appropriate for this situation.

M208 defines the size of the reachable area of the nozzle. Sometimes the nozzle can go outside of the bed area. If this is the case in the negative sides of the bed, you set 0,0 to be the front left corner of the bed, and if the nozzle leaves the edge of the bed when the print head is moving to the endstop, you can use that negative value in the M208 minima. That will keep the slicer center matched to the bed center. Make sense?

When homing the Z axis, you must move the nozzle to the point where the probe is at the center. In other words, you must take the G31 offset into account yourself when positioning the nozzle. This may be a bit different from how repetier and marlin do it.

Does that make sense?

jallen810

I followed the link you suggested but then found BeTru3D’s guide more intuitive. My plan was to the Z-probe bird inputs to power my BLtouch 3.1 and wire it accordingly. But I couldn’t get the probe to do it’s startup self-test when I had the yellow wire plugged into the z_probe_mod pin and P9 selected. I tried both 3.3v and 5v. So I ended up following BeTrue’s wiring for the yellow wire and P5. And it’s working.. if you can shed some light as to why I’d love to do it correctly.

As for offsets, I think what ur saying is G31 is for nozzle reach capability and I need to use some other command, ex. What I did with homeall.g and homez.g to tackle homing z-probe on bed. Is that correct?
So if my nozzle reach capability hasn’t changed then:
G31 X0 Y0 Z0 S1 should be correct vs G31 X58 Y-36 Z0 S1
That will solve the slicers being offset?

Phaedrux

@jallen810 said in Another BL touch config question: Y-offset this time:

I had the yellow wire plugged into the z_probe_mod pin and P9 selected.

Follow this wiring setup for the Duet Wifi

https://duet3d.dozuki.com/Wiki/Connecting_a_Z_probe#Section_Duet_2_WiFi_Ethernet_without_a_Duex_2_or_Duex_5_expansion_board

alt text

G31 X58 Y-36 sounds correct for your offset (58mm to the right, and 36mm in front of the nozzle). There is no S1 for G31. The Z offset must be measured as described in the previous link.

@jallen810 said in Another BL touch config question: Y-offset this time:

What I did with homeall.g and homez.g to tackle homing z-probe on bed. Is that correct?

G90                     ; absolute positioning
G1 X15 Y50 F6000        ; go to first bed probe point and home Z (modified Y=15 to Y=50 so Z-axis will home on build plate)
G30                     ; home Z by probing the bed

I would change the G1 X15 Y50 to whatever coordinates are needed to move the nozzle such that the probe is in the center of the bed. For example, if the bed is 300x300 then 150,150 would be the center, and if the probe offset is x58 Y-36, then you'd have to take that into account. so if you moved the nozzle to G1 X92 Y186 that should move the probe to the center point.

jallen810

Okay that clears that up, i will try running the wiring that way and modifying my G31.
Will i need to tell my slicer's that "Home" is now in the center of the bed?
For example, S3D Homing Direction & Origin Offset.JPG S3D, see screen shot, is that done by changing Homing Direction from X=Max and Y=Min to X=Center Y=Center, and using the same S3D Origin Offsets in S3D as i use in G31 X=92, Y=186?

Phaedrux

No no, 0,0 isn't the center of the bed. That's not what I was getting at. 0,0 is still the front left corner. What the homeall is doing is just moving the probe to the center of the bed, since that's the best place to measure the Z height.

jallen810

@Phaedrux I see so G31 sets bed capability, and Homeall.g just tells m/c to go "here" and say i'm there and ready to do stuff.
I am assuming the same would be true for the HomeZ.g file as well?
Sorry for the laymans terms but that sounds like what i am after.

Phaedrux

Yes, homeall and homez are generally quite similar when using a probe because the probe must be placed in X and Y for probing, unlike a Z endstop which is in a fixed location, so even in homez you usually will be homing X and Y. If you don't do that, and you try and homez without the X and Y axis being homed first, the homez will fail.

jallen810

@Phaedrux said in Another BL touch config question: Y-offset this time:

                                                                                                                            M558 A1 F400			; Set single probing at faster feed rate                                                                                                                                                                            G30 				; Do a single probe to home our Z axis                                                                                                                                                                            M558 A10 F100			; Set multi probing at slower feed rate                                                                                                                                                                            G30				; Probe again to get a more accurate position

Phaedruex,
Where do I call these 4 lines of code you mentioned? in my config.g or in the start of my Starting Code for slicer?
Also, you and @droftarts both refer to G30 alot rather than G29 or G32, which BeTrue3D did in his setup guide for BLtouch, am I missing something? I thought G30 is just to calibrate BLtouch, not for using to do a mesh bed level.
G29's take a long time at F50-150 for a 300x300 bed. Can I get solid, consistent results with a G30 pair with a "historical" G29 mapping or a simple G32?

Phaedrux

Those lines go in your homeall to replace the single G30 that's already in there.

G30 is used to call the probe and use it to find Z0.

https://duet3d.dozuki.com/Wiki/Gcode#Section_G30_Single_Z_Probe

Mesh bed leveling is done by calling G29.

https://duet3d.dozuki.com/Wiki/Gcode#Section_G29_Mesh_bed_probe

G32 just calls the macro bed.g in the /sys/ folder. It doesn't do anything on it's own anymore. Inside bed.g you can script up some more advanced things like independent motor tramming of the bed.

https://duet3d.dozuki.com/Wiki/Gcode#Section_G32_Probe_Z_and_calculate_Z_plane

If G29 takes a long time to run, you can either reduce the spacing of the points probed to reduce the detail in case your bed is very flat. Or you can simply load the saved heightmap at print time rather than probing the whole thing over again. G29 S1 loads the saved map. G29 will save the heightmap automatically.

It's all laid out in the Mesh compensation link: https://duet3d.dozuki.com/Wiki/Using_mesh_bed_compensation

jallen810

@Phaedrux Okay I've update my config.g and the G31 X0 Y0 Z(offset value)
I think has worked.

I am pulling ground (both black and brown) from the z-probe ground like you see [here] (https://d17kynu4zpq5hy.cloudfront.net/igi/duet3d/BJKPq1sdZcJNUmP4.full)
and I have wired the yellow wire like you suggested to the #8 pin labeled "Heater3" on Duet Pinout sheet like you see here
I made these changes to my config.g so they now read:
M307 H3 A-1 C-1 D-1
M558 P9 H5 F120 T16000

I also adjust Homeall and HomeZ to X=92 and Y=186, that worked now like it should

Lastly, adjusted my Deploy/Retract probes to:
M280 P3 S10
and I also tried M280 P64 S10 I1

Here is where I run into the same problem I had originally, when I home my Z the probe doesn't deploy and it gives me an error about the servo not being called or correct... something to that effect.
I have also tried hooking up the yellow cable to the Z_probe_mod pin on Duet Board and change M280 to P64/65 and neither of those work either...
Any suggestions?

jallen810

@Phaedrux said in Another BL touch config question: Y-offset this time:

Those lines go in your homeall to replace the single G30 that's already in there.

G30 is used to call the probe and use it to find Z0.

https://duet3d.dozuki.com/Wiki/Gcode#Section_G30_Single_Z_Probe

Mesh bed leveling is done by calling G29.

https://duet3d.dozuki.com/Wiki/Gcode#Section_G29_Mesh_bed_probe

G32 just calls the macro bed.g in the /sys/ folder. It doesn't do anything on it's own anymore. Inside bed.g you can script up some more advanced things like independent motor tramming of the bed.

https://duet3d.dozuki.com/Wiki/Gcode#Section_G32_Probe_Z_and_calculate_Z_plane

If G29 takes a long time to run, you can either reduce the spacing of the points probed to reduce the detail in case your bed is very flat. Or you can simply load the saved heightmap at print time rather than probing the whole thing over again. G29 S1 loads the saved map. G29 will save the heightmap automatically.

It's all laid out in the Mesh compensation link: https://duet3d.dozuki.com/Wiki/Using_mesh_bed_compensation

THIS^ YOU NEED TO PUBLISH THIS on these two pages, so poor saps like me don't run around in circles like chickens minus heads!!!
Page 1
Page 2

Phaedrux

@jallen810 said in Another BL touch config question: Y-offset this time:

I am pulling ground (both black and brown) from the z-probe ground like you see [here] (https://d17kynu4zpq5hy.cloudfront.net/igi/duet3d/BJKPq1sdZcJNUmP4.full)

This is the diagram for the Maestro board. Don't use this one.

@jallen810 said in Another BL touch config question: Y-offset this time:

and I have wired the yellow wire like you suggested to the #8 pin labeled "Heater3" on Duet Pinout sheet like you see here

This is the Duet Wifi diagram, which you said you had, so use this one as shown.

@jallen810 said in Another BL touch config question: Y-offset this time:

and I also tried M280 P64 S10 I1

That's for the maestro, don't use that one.

If you are using reprapfirmware 2 and the wifi, you should use M280 P3 S10 I1. P3 for the heater pin 3, and I1 to invert it.

jallen810

@Phaedrux Yes I have a Duet2 WiFi model, but power is power and ground is ground as long as all the grounds lead to a main ground somewhere on the board. So where I get power and ground from should not matter?

I just tried M280 P3 S10 I1 and that doesn't work still. I will swap the wiring and try again..

EDIT I just wired like this as you said, and now my BLtouch powers on but doesn't do it's startup sequence of 2 self-test cycles. This is what was happening when I originally tried to wire it this way

jallen810

@Phaedrux any ideas why the Duet3D method Of wiring would not work?
And what other options do I have for setting a probe offset?

dc42

@jallen810 said in Another BL touch config question: Y-offset this time:

I followed the link you suggested but then found BeTru3D’s guide more intuitive.

Unfortunately, that guide is out of date.

dc42

@jallen810 said in Another BL touch config question: Y-offset this time:

Lastly, adjusted my Deploy/Retract probes to:
M280 P3 S10
and I also tried M280 P64 S10 I1

The correct command for a Duet WiFi or Duet Ethernet running RRF2 without an attached DueX board is: M280 P3 S10 I1

(that's uppercase-letter-i followed by digit-1 at the end). M280 P64 S10 I1 is for the Duet Maestro.

Can you provide a photo showing how you have connected the BLTouch to the Duet?

If you have a config-override.g file in your /sys folder, check that there is no M307 H3 command in it.

jallen810

@dc42 @Phaedrux I took 2 pictures for you guys.
The first is how I got the BLtouch to actually probe using P5 mode.

And the second I wired up and attempt to use but BLtouch won't do self-test. But I can get it to manually deploy/retract with M280 P3 S10/90 I1 commands.

I checked my config.override and did find and H3 and commented it out, that did NOT solve the issue. Any other suggestions?

Lastly, how can I solve this bed boundary misalignment? Is there a G-code to tell the bed where the probe offset is?

Phaedrux

@jallen810 said in Another BL touch config question: Y-offset this time:

And the second I wired up and attempt to use but BLtouch won't do self-test. But I can get it to manually deploy/retract with M280 P3 S10/90 I1 commands.

In your first picture it doesn't look like you have any servo wires connected, so it's not going to be able to control the pin like that.

The second photo looks more correct for the Duet Wifi, and you say you're able to control the pin, so that's a good start.

How are you trying to do the self-test? Does it do a self test at power up?

Have you tried testing it's operation yet?

https://duet3d.dozuki.com/Wiki/Test_and_calibrate_the_Z_probe#main

Can you post your current config.g, homeall.g, homez.g, bed.g, deployprobe.g, retractprobe.g, config-override.g files please for verification?

jallen810

@Phaedrux @dc42 The first picture works by running P5 on pin 7 but I want to do it "right" via P9 as you are suggesting.
My biggest concern at the moment is not being able to use all of my bed.
I am attaching all of my sys files in a GoogleDrive folder for you. I very much appreciate all of the deep dive troubleshooting! This is an amazing community!

https://drive.google.com/drive/folders/16hlgYO5NkJfsM0njdcNSuSkMSUl3Cbbw?usp=sharing

Phaedrux

I'll go through your configs and point out anything that seems off.

In config.g your Z axis max speed seems a bit high. If it's set too high it may bind/stall/skip steps. So be sure to test it to see if it's actually a safe speed. 600mm/min (10mm/s) is probably a more reasonable value.

M203 X6000.00 Y6000.00 Z1500.00 E3000.00 ; set maximum speeds (mm/min)

On the flip side of that, your Z and E axis jerk values are a bit on the low side which may cause you some issues with mesh compensation and pressure advance, respectively.

M566 X800.00 Y980.00 Z12.00 E180.00 ; set maximum instantaneous speed changes (mm/min)

I would recommend Z60 and E2500

For the BLtouch

M558 P9 H5 F100 T16000  ; (Duet3D method) P=Select Z-probe mode=9 BLtouch. H=DiveHeight abv bed(mm), F=Speed bed moves, T=TravelSpeed btwn pts 
G31 P500 X0 Y0 Z0.59               ; P=Z probe trigger value,X&Y=offset for mount relative to nozzle (mm), Z=trigger height "Z-offset"(mm)

M558 T16000 for the travel speed between probe points is higher than your XY axis max speed. It will be limited to 6000mm/min.

Your G31 still doesn't have your probe/nozzle offsets. Based on what you mentioned in your first post it should be X58 Y-36. Without those values the heightmap will be applied incorrectly.

Change G31 P500 to G31 P25

And your trigger height of 0.59mm seems quite low. When the BLTouch is mounted correctly based on the Antclabs manual the base of the probe body should be ~8mm above the nozzle tip which will give a trigger height of ~2mm.

For the mesh grid, in order to maximize the probe points and reachable area we need to account for the probe offset. If you take the axis limits from M208 and subtract the offsets you get the reachable area. Round up or down a bit and then choose a spacing that divides into the range evenly.

M557 X0:225 Y45:300 S45 would become M557 X60:300 Y0:260 S20

Then when you use G29 it should map the entire reachable area of the bed with a 20mm spacing.

For your fan arrangement, it's recommended to use Fan0 as the part cooling fan because the slicers generally don't allow you to choose a fan number. So it makes sense as the default. Plus, the Duet defaults to using the Fan1 port as the heatsink and it will spin up the fan immediately at power on just in case you did a reset with the hotend hot, it can help prevent jams from heat creep.

M106 P1 C"PartCool_FAN0" S0 I0 F500 H-1              ; set fan 1 name, value, PWM signal inversion and frequency. Thermostatic control is turned on
M106 P0 C"HeatSink_FAN1" S1 I0 F500 H1 T45            ; set fan 2 name, value, PWM signal inversion and frequency. Thermostatic control is turned off

To change it to match the expected defaults just swap the fan ports and change then swap P1 and P0 in config.

This also makes more sense because your current tool definition selects fan0 as the tool fan.

M563 P0 S"HOTEND0" D0 H1 F0

The rest of your config looks ok.

As for the BLTouch, answer my previous questions as I'm not sure what is or isn't working.

@Phaedrux said in Another BL touch config question: Y-offset this time:

How are you trying to do the self-test? Does it do a self test at power up?
Have you tried testing it's operation yet?
https://duet3d.dozuki.com/Wiki/Test_and_calibrate_the_Z_probe#main