@jay_s_uk

I kinda got what you meant. I tried using the following parameters and not It is not making noise anymore and works properly.

M915 X Y S5 R1 F1 H2  ; set sensorless homing

Do I need to put the same M915 at the end of my config.g after the endstop section? (instead of M915 X Y R0 F0)

Also, using a Biqu microprobe as Z sensor - Should I use the same parameters for Z axes such as D3 for stealthchop? Does my homez looks good:

; homez.g
; called to home the Z axis
;
; generated by RepRapFirmware Configuration Tool v3.5.8 on Tue Dec 10 2024 15:03:23 GMT-0500 (Eastern Standard Time)

; ################# Home Z Preparation ################

G91 															; Relative mode
G1 H2 Z5 F5000													; Lower the bed
G90	
var xCenter = move.compensation.probeGrid.mins[0] + (move.compensation.probeGrid.maxs[0] - move.compensation.probeGrid.mins[0]) / 2 - sensors.probes[0].offsets[0]
var yCenter = move.compensation.probeGrid.mins[1] + (move.compensation.probeGrid.maxs[1] - move.compensation.probeGrid.mins[1]) / 2 - sensors.probes[0].offsets[1]
G1 X{var.xCenter} Y{var.yCenter} F4000 ; go to bed centre															; Back to absolute positioning

; ################# Home Z Preparation ################

G30					 											; Probe a single point

Hi there,

I made a dual extrusion setup (basically using T0/T1 tools) but I'm not sure how the Gcode should look like. Both are mounted on the same carriage.

I'd like to be able to control both extruders indepedently and simultaneously. In other words, I would like to send an extrusion command with T1 like G1 E4000 F100 (continuous extrusion) and simultaneously print with T0 while letting T1 do its job.

I've heard about M605 command. Is it how I'm supposed to do it?

.gcode:

; Enable simultaneous extrusion for both extruders
M605 P0 S1 D0 ; Set extruder 0 to simultaneous extrusion mode
M605 P1 S1 D0 ; Set extruder 1 to simultaneous extrusion mode

; Start extrusion from both T0 and T1 simultaneously
T1 ; Select extruder 1 (T1)
G1 E4000 F300 ; Extrude continuously from T1

T0 ; Select extruder 0 (T0)
G1 X0 Y0 Z0.2 F1200 ; Move to starting position
G1 X10 Y0 E10 F140 ; Move to (10,0), extrude 10mm with T0
G1 X10 Y10 E20 F140 ; Move to (10,10), extrude 20mm with T0
G1 X0 Y10 E30 F140 ; Move to (0,10), extrude 30mm with T0
G1 X0 Y0 E40 F140 ; Move to (0,0), extrude 40mm with T0

As I'm making my own custom gcode, I'd like to see how I'm supposed to organize the .gcode file. Would you have any other examples?

Thanks for your light!

Tim

@fcwilt

Right now, when probing, the carriage goes in the center which is perfect during homing.
However my nozzle isn't at the same location and is offset by a few cm in each of XY directions.

So I'd like to set it up to make sure it is probing in the center but when printing, it takes the nozzle as the HRP.

In this case should I use G31? I gave it a try a now the nozzle goes at the center while probing. Is it normal?

Thank you!

Hi all,

I'd like to set up the XYZ offsets of my custom printhead. What's the best way to do it?
I've red G31 and G10 in config.g can be used to set the offsets? I've also seen M206 somewhere but not sure about that one... How would you do it?

Thanks!

@fcwilt

Hi Frederick,

I like your approach. Could you please show a test file?

Thank you,

TIM

@gloomyandy

UPDATE:

I tried tweaking the var commands it seems that the following are much better:

var xCenter = (move.axes[0].min + move.axes[0].max) / 2 - sensors.probes[0].offsets[0]
var yCenter = (move.axes[1].min + move.axes[1].max) / 2 - sensors.probes[0].offsets[1]

At least, X and Y are now moving to a point on the bed. It is not the center but maybe it comes from the offset settings.. Do you know how to deal with this? Would you also have an idea why I cannot raise Z much?

@gloomyandy

Here is the answer from echo: X center -0.5 y center -0.5
I forgot to mention that my homez had been done through the RRF config tool.

And here is the video:
IMG_5972.mp4

What you see in the video:
-Homing X and Y work
-Homing Z is sending the bed in the wrong direction and probing is not at bed center.

I also have another problem that is not visible on the video. I can't raise the Z axis more than 10 cm above the bed. The motors jam and make a lot of noise.

Hopefully you'll see what I mean. Let me know if you need further details.

@gloomyandy

Thanks for your help!
Following your advice, I'm now calling my home macros in my homeall.g.
However, after changing homez according to your suggestion, I still have problems. In the following file, the printer is sending the bed on the low end (towards me) although is should go in the high end. Then, it is probing without moving to the center (X not moving). What is weird is that home XY both work as expected.

; homez.g
; increase Z

G91                                    ; relative positioning
G1 H2 Z5                               ; move Z relative to current position to avoid dragging nozzle over the bed
G90                                    ; absolute positioning

; home Z
; NOTE: The following XY position is determined from the probe grid defined in the next section
var xCenter = move.compensation.probeGrid.mins[0] + (move.compensation.probeGrid.maxs[0] - move.compensation.probeGrid.mins[0]) / 2 - sensors.probes[0].offsets[0]
var yCenter = move.compensation.probeGrid.mins[1] + (move.compensation.probeGrid.maxs[1] - move.compensation.probeGrid.mins[1]) / 2 - sensors.probes[0].offsets[1]
G1 X{var.xCenter} Y{var.yCenter} F6000 ; go to bed centre
M401
G30                                    ; probe the bed
M402 ; retract probe

In my config.g, I have the following. M574 Y2 S3 should indicate to home in the high end.

; Endstops
M574 X1 S3                            ; configure X axis endstop
M574 Y2 S3                            ; configure Y axis endstop
M574 Z1 S2                            ; configure Z axis endstop
M915 X Y R0 F0

Home X and home Z work now:

; homex.g
; called to home the X axis
;
; generated by RepRapFirmware Configuration Tool v3.5.8 on Tue Dec 10 2024 15:03:23 GMT-0500 (Eastern Standard Time)

; increase Z
G91 ; relative positioning
G1 H2 Z5 ; move Z relative to current position to avoid dragging nozzle over the bed
G90 ; absolute positioning
M400
M913 X70 Y70 ; drop motor current to 40% -> for sensorless homing
M400

; home X
G91 ; relative positioning
var maxTravel = move.axes[0].max - move.axes[0].min + 5 ; calculate how far X can travel plus 5mm
G1 H1 X{-var.maxTravel} F3000                            ; coarse home in the -X direction
G1 X5 F3000                                             ; move back 5mm
G1 H1 X{-var.maxTravel} F1000                            ; fine home in the -X direction
G90 ; absolute positioning

; decrease Z again
G91 ; relative positioning
G1 H2 Z-5 F6000 ; move Z relative to current position
G90 ; absolute positioning

M400 ; Wait for current moves to finish
M913 X100 Y100 ; return current to 100% -> for sensorless homing
M400 ; Wait for current moves to finish

; homey.g
; called to home the Y axis
;
; generated by RepRapFirmware Configuration Tool v3.5.8 on Tue Dec 10 2024 15:03:23 GMT-0500 (Eastern Standard Time)

; increase Z
G91 ; relative positioning
G1 H2 Z5 ; move Z relative to current position to avoid dragging nozzle over the bed
G90 ; absolute positioning

M400 ; Wait for current moves to finish
M913 X70 Y70 ; drop motor current to 70% -> for sensorless homing
M400

; home Y
G91                                                     ; relative positioning
var maxTravel = move.axes[1].max - move.axes[1].min + 5 ; calculate how far Y can travel plus 5mm
G1 H1 Y{var.maxTravel} F3000                             ; coarse home in the +Y direction
G1 Y-5 F3000                                            ; move back 5mm
G1 H1 Y{var.maxTravel} F2000                             ; fine home in the +Y direction
G90                                                     ; absolute positioning

; decrease Z again
G91 ; relative positioning
G1 H2 Z-5 F6000 ; move Z relative to current position
G90 ; absolute positioning

M400 ; Wait for current moves to finish
M913 X100 Y100 ; return current to 100% -> for sensorless homing
M400 ; Wait for current moves to finish

Would you have an idea?

@jay_s_uk

Okay, now I get it.

Now it's moving but I cannot figure out why it's not moving to the center.
Even replacing the following variables by simple G1 X150 Y150 do not work:

var xCenter = move.compensation.probeGrid.mins[0] + (move.compensation.probeGrid.maxs[0] - move.compensation.probeGrid.mins[0]) / 2 - sensors.probes[0].offsets[0]
;var yCenter = move.compensation.probeGrid.mins[1] + (move.compensation.probeGrid.maxs[1] - move.compensation.probeGrid.mins[1]) / 2 - sensors.probes[0].offsets[1]

I mean, it randomly works, sometimes yes, sometimes not...

@jay_s_uk

Indeed, but I cannot home Z. I always have the Error: Insufficient axes homed for bed probing.

@dc42

I've been following your steps:

1. manually placed the probe at the center
2. Used G92 X0 Y0 as Z homing does not work after I individually homed XY.
   If I try homing Z without G92, it says: "Error: G30: Insufficient axes homed for bed probing."
3. Using M401 works well deploying the probe
4. Manually pushing the probe after G30 works well.

However here are my problems now:
-Z homing doesn't not work alone as It always sends the error mentioned.
-Sending move commands to Z always gives the same error.
-When homed, sending move commands to Y does not work well (bumping against wall with positive integers, and only accepts -10 maximum with negative ones.
-After homing all, sending move commands to Z works but stops after a bit making a noise
-Homing all works but makes a lot more noise than homing X and Y individually.
-When homing all axes, the extruder is NOT going to the center of the bed before probing...