(solved) G28 Error: Bad command

Karim

I am getting G28 Error: Bad command: ''' Now home Z using the Z probe''' everytime I home my printer, Also if I try home Z axis only I get this below. I am using a mini differential ir height sensor.

G28 Z

Error: Bad command: ''' Home Z using the Z probe mounted on the X carriage'''
Error: G0/G1: insufficient axes homed

; Configuration file for Duet WiFi (firmware version 1.21)
; executed by the firmware on start-up
;
; generated by RepRapFirmware Configuration Tool v2 on Mon Dec 10 2018 01:47:39 GMT+0000 (GMT)

; General preferences
G90 ; Send absolute coordinates...
M83 ; ...but relative extruder moves

; Network
M550 P"iDEX" ; Set machine name
M552 S1 ; Enable network
M587 S"xx" P"xx" ; Configure access point. You can delete this line once connected
M586 P0 S1 ; Enable HTTP
M586 P1 S0 ; Disable FTP
M586 P2 S0 ; Disable Telnet

; Drives
M569 P0 S0 ; Drive 0 goes reverse
M569 P1 S0 ; Drive 1 goes reverse
M569 P2 S1 ; Drive 2 goes forwards
M569 P3 S0 ; Drive 3 goes reverse
M569 P4 S1 ; Drive 4 goes reverse
M569 P5 S0 ; Drive 5 goes reverse

M584 X0 Y1 Z2 U3 E4:5 ; Drive map X Y Z U E axis

M350 X16 Y16 Z16 U16 E16:16 I1 ; Configure microstepping with interpolation
M92 X160 Y160 Z1600 U160 E512.96:512.96 ; Set steps per mm
M566 X600 Y600 Z12 U600 E120:120 ; Set maximum instantaneous speed changes (mm/min)
M203 X18000 Y18000 Z180 U18000 E1500:1500 ; Set maximum speeds (mm/min)
M201 X3000 Y3000 Z100 U3000 E10000:10000 ; Set accelerations (mm/s^2)
M906 X950 Y1300 Z1300 U950 E1200:1200 I30 ; Set motor currents (mA) and motor idle factor in per cent
M84 S30 ; Set idle timeout

; Axis Limits
M208 X375 Y390 U422 Z320 S0 ; Set axis maxima
M208 X-60 Y10 U0 Z0 S1 ; Set axis minima

; Endstops
M574 X1 Y1 Z0 U2 S0 ; Set active low endstops

; Endstops
M574 X1 Y1 S0 ; Set active low and disabled endstops

; Z-Probe
M574 Z0 S2 ; Set endstops controlled by probe
M558 P1 H5 F120 T6000 ; Set Z probe type to unmodulated and the dive height + speeds
G31 P500 X0 Y0 Z1.258 ; Set Z probe trigger value, offset and trigger height
M557 X30:375 Y50:390 S82 ; Define mesh grid

; Heaters
M307 H0 B0 S1.00 ; Disable bang-bang mode for the bed heater and set PWM limit
M305 P0 T100000 B4138 R4700 ; Set thermistor + ADC parameters for heater 0
M143 H0 S120 ; Set temperature limit for heater 0 to 120C
M305 P1 T100000 B4138 R4700 ; Set thermistor + ADC parameters for heater 1
M143 H1 S280 ; Set temperature limit for heater 1 to 280C
M305 P2 T100000 B4138 R4700 ; Set thermistor + ADC parameters for heater 2
M143 H2 S280 ; Set temperature limit for heater 2 to 280C

; Fans
M106 P0 S0 I0 F500 H1 T45 ; Set fan 0 value, PWM signal inversion and frequency. Thermostatic control is turned on
M106 P1 S1 I0 F500 H2 T45 ; Set fan 1 value, PWM signal inversion and frequency. Thermostatic control is turned on
M106 P2 S1 I0 F500 H2 T45 ; Set fan 2 value, PWM signal inversion and frequency. Thermostatic control is turned on

; Tools
M563 P0 D0 H1 ; Define tool 0
G10 P0 X0 Y0 U0 Z0 ; Set tool 0 axis offsets
G10 P0 R0 S0 ; Set initial tool 0 active and standby temperatures to 0C

M563 P1 D1 H2 X3 ; Define tool 1
G10 P1 X0 Y0 U0 Z0 ; Set tool 1 axis offsets
G10 P1 R0 S0 ; Set initial tool 1 active and standby temperatures to 0C

M563 P2 D0:1 H1:2 X0:3 ; Define tool 2 Ditto Printing
G10 P2 X100 Y0 U-100 Z0 ; Set tool 2 axis Ditto Printing offsets
G10 P2 R0 S0 ; Set initial tool 2 active and standby temperatures to 0C
M567 P2 E1:1 ; Set mix rtio 100% on both extruders

; Automatic power saving
M911 S10 R11 P"M913 X0 Y0 G91 M83 G1 Z3 E-5 F1000" ; Set voltage thresholds and actions to run on power loss

; Custom settings are not configured

; homeall.g
; called to home all axes
;
; generated by RepRapFirmware Configuration Tool v2 on Sat Dec 01 2018 16:55:23 GMT-0800 (Pacific Standard Time)
G91 ; relative positioning
G1 Z5 F6000 S2 ; lift Z relative to current position
G1 S1 X-435 Y-400 U422 F3000 ; move quickly to X and Y axis endstops and stop there (first pass)
G1 X5 Y5 F6000 ; go back a few mm
G1 S1 X-10 Y-10 U10 F360 ; move slowly to X and Y axis endstops once more (second pass)

''' Now home Z using the Z probe'''
G1 X245 Y200 F2000 S2 ; move to bed centre for probing
G30 ; probe the bed and set Z height

; homex.g
; called to home the X axis
;
; generated by RepRapFirmware Configuration Tool v2 on Sat Dec 01 2018 16:55:23 GMT-0800 (Pacific Standard Time)
G91 ; relative positioning
G1 Z5 F6000 S2 ; lift Z relative to current position
G1 S1 X-435 F3600 ; move quickly to X axis endstop and stop there (first pass)
G1 X5 F6000 ; go back a few mm
G1 S1 X-10 F360 ; move slowly to X axis endstop once more (second pass)
G1 Z-5 F6000 S2 ; lower Z again
G90 ; absolute positioning

; homeu.g
; called to home the U axis
;
; generated by RepRapFirmware Configuration Tool v2 on Sat Dec 01 2018 16:55:23 GMT-0800 (Pacific Standard Time)
G91 ; relative positioning
G1 Z5 F6000 S2 ; lift Z relative to current position
G1 S1 U422 F3600 ; move quickly to U axis endstop and stop there (first pass)
G1 U-5 F6000 ; go back a few mm
G1 S1 U10 F360 ; move slowly to U axis endstop once more (second pass)
G1 Z-5 F6000 S2 ; lower Z again
G90 ; absolute positioning

; homey.g
; called to home the Y axis
;
; generated by RepRapFirmware Configuration Tool v2 on Sat Dec 01 2018 16:55:23 GMT-0800 (Pacific Standard Time)
G91 ; relative positioning
G1 Z5 F6000 S2 ; lift Z relative to current position
G1 S1 Y-390 F2000 ; move quickly to Y axis endstop and stop there (first pass)
G1 Y5 F6000 ; go back a few mm
G1 S1 Y-10 F360 ; move slowly to Y axis endstop once more (second pass)
G1 Z-5 F6000 S2 ; lower Z again
G90 ; absolute positioning

''' Home Z using the Z probe mounted on the X carriage'''
G91
G1 Z4 F200 ; raise head 4mm to keep it clear of the bed
G1 U429 F2000 ; make sure the U carriage is out of the way
G90
G1 X245 Y200 F2000 S2 ; move to bed centre for probing
G30 ; probe the bed and set Z height

Solve See in the end of this .

Stephen6309

@karim said in G28 Error: Bad command: ''' Now home Z using the Z probe''':

G1 S1 X-10 Y-10 U10 F360 ; move slowly to X and Y axis endstops once more (second pass)
''' Now home Z using the Z probe'''
G1 X245 Y200 F2000 S2 ; move to bed centre for probing

Fix the "Now home Z using the Z probe" line with a ; at the beginning of the line

Same in the other homing files. The firmware doesn't know what a quoted text line is.

Karim

Hey Stephen Thanks, That fix the first error.

If I move Z axis down 5mm or 10mm and then try home Z axis only, I get this below. I am using a mini differential IR height sensor. I can home X Y U fine. But Z axis only home when I home all axis. Don't know if this is how it suppose works.

G28 Z

Error: Bad command: ''' Home Z using the Z probe mounted on the X carriage'''
Error: G0/G1: insufficient axes homed

Phaedrux

You need to add S2 to moves of axis that haven't been homed yet. In your case it might just be easier to always home x and y first.

Karim

Ok, After I home X Y U & Z axis, Everything looks ok, no errors in log, But if I move Z axis down say 10mm and try homing Z axis I get this G28 Z , Error: G0/G1: insufficient axes homed . I am just trying to make sure that Z axis is ok.

Phaedrux

If you compare the example homing files here: https://duet3d.dozuki.com/Wiki/ConfiguringRepRapFirmwareCartesianPrinter#Section_Homing_files to what you have you'll see what I mean about missing S2 from your G1 moves that try to move an axis before it's been homed.

Also take care with G90 and G91 to ensure you're in the right coordinate mode for the moves you want to be doing. Do you want to go to Z5, or just move the bed by 5mm?

deckingman

@karim Are you saying that if you home all, everything works fine but if you just want to home Z you get the error? It's a long time since I checked but it always used to be the case that you have to home X and Y before you can home Z, which makes sense if you use a probe.

Stephen6309

@karim They way I fixed my homing files: In each added S2 to all movements that didn't involve the endstops, the S1 lines.

Karim

Here a video explaining what I am trying to say. This might be ok,
https://youtu.be/BKMrRjuZcC8

Phaedrux

@karim So the homeall button turns red when you hit home z to indicate that the machine is no longer fully homed. If the home z were able to complete successfully, the homeall button would turn back to homed state.

Can you post the contents of homez.g as it is now?

Karim

; Home Z using the Z probe mounted on the X carriage'''
G91
G1 Z4 F200 ; raise head 4mm to keep it clear of the bed
G1 U429 F2000 ; make sure the U carriage is out of the way
G90
G1 X245 Y200 F2000 S2 ; move to bed centre for probing
G30 ; probe the bed and set Z height

Phaedrux

And if you change it to this, what happens?

G91
G1 Z4 F200 S2 ; raise head 4mm to keep it clear of the bed
G1 U429 F2000 S2 ; make sure the U carriage is out of the way
G90
G1 X245 Y200 F2000 S2 ; move to bed centre for probing
G30 ; probe the bed and set Z height

Karim

@phaedrux said in G28 Error: Bad command: ''' Now home Z using the Z probe''':

G1 U429 F2000 S2 ; make sure the U carriage is out of the way

G1 U429 F2000 S2 ; make sure the U carriage is out of the way
S2 Make the U Axis goes into the endstop. Replace S2 to S1 fix that.

Now Z axis works but something wired now, look at the video when homing Z axis, X axis move about 20mm then Z home.

https://youtu.be/Her4tOeW25w

;Home Z
G91
G1 Z4 F200 S2 ; raise head 4mm to keep it clear of the bed
G1 U422 F2000 S1 ; make sure the U carriage is out of the way
G90
G1 X245 Y200 F2000 S2 ; move to bed centre for probing
G30 ; probe the bed and set Z height

; homeall.g
; called to home all axes
;
; generated by RepRapFirmware Configuration Tool v2 on Sat Dec 01 2018 16:55:23 GMT-0800 (Pacific Standard Time)
G91 ; relative positioning
G1 Z5 F6000 S2 ; lift Z relative to current position
G1 S1 X-435 Y-400 U422 F3000 ; move quickly to X and Y axis endstops and stop there (first pass)
G1 X5 Y5 F6000 ; go back a few mm
G1 S1 X-10 Y-10 U10 F360 ; move slowly to X and Y axis endstops once more (second pass)

;Now home Z using the Z probe'''
G1 X245 Y200 F2000 S2 ; move to bed centre for probing
G30 ; probe the bed and set Z height

Phaedrux

As I said before, you need to pay attention to G90 and G91

G90 moves to the absolute position on the bed
G91 moves the amount relative to the current location

So for your home all it looks like you're still in relative positioning when you should be in absolute positioning to place the print head for probing Z

; homeall.g
; called to home all axes
;
; generated by RepRapFirmware Configuration Tool v2 on Sat Dec 01 2018 16:55:23 GMT-0800 (Pacific Standard Time)
G91 ; relative positioning
G1 Z5 F6000 S2 ; lift Z relative to current position
G1 S1 X-435 Y-400 U422 F3000 ; move quickly to X and Y axis endstops and stop there (first pass)
G1 X5 Y5 F6000 ; go back a few mm
G1 S1 X-10 Y-10 U10 F360 ; move slowly to X and Y axis endstops once more (second pass)

G90 ; absolute positioning
;Now home Z using the Z probe'''
G1 X245 Y200 F2000 S2 ; move to bed centre for probing
G30 ; probe the bed and set Z height

That should get your print head into the same location for both homeall and homez. Now that may not be the position you expect it to be in, but you can modify that by just changing the coordinates for both.

I suspect that your X endstop position is actually a bit off the side of the bed.

Karim

@karim said in G28 Error: Bad command: ''' Now home Z using the Z probe''':

;Home Z
G91
G1 Z4 F200 S2 ; raise head 4mm to keep it clear of the bed
G1 U422 F2000 S1 ; make sure the U carriage is out of the way
G90
G1 X245 Y200 F2000 S2 ; move to bed centre for probing
G30 ; probe the bed and set Z height

I think I got now. Machine Status shows X185 Y210
;Home Z
G91
G1 Z4 F200 S2 ; raise head 4mm to keep it clear of the bed
G1 U422 F2000 S1 ; make sure the U carriage is out of the way
G90
G1 X185 Y210 F2000 S2 ; move to bed centre for probing
G30 ; probe the bed and set Z height

Karim

Thank you. This was driving me nuts.