Use M119 to check the endstop state when triggered and untriggered.

Turns out one of the leads on my endstop came unplugged, should have known to check that.

The automatic checking of the endstop-states is an interesting idea. I'll see if I can implement it.

Use M119 to check the endstop state when triggered and untriggered.

Turns out one of the leads on my endstop came unplugged, should have known to check that.

The automatic checking of the endstop-states is an interesting idea. I'll see if I can implement it.

Hello I am having issues with the U-Axis homing on my IDEX setup. This just started today though I haven't touched the firmware in awhile and wasn't having issues before. Instead of moving to the end of the axis and hitting the enstop, backing off and hitting it again slower, only the back off move is happening and the U-Axis print head just steps along the axis away from the endstop every time the U-Axis homing is called. Here is my homeu.g file:

G91 ; relative positioning
G1 H1 U320 F3000 ; move quickly to U axis endstop and stop there (first pass)
G1 H2 U-5 F6000 ; go back a few mm
G1 H1 U320 F360 ; move slowly to U axis endstop once more (second pass)
G90 ; absolute positioning

It's exactly the same as my homex file just moving the opposite direction though I'm not having this problem with the X-Axis so I'm really not sure why this is happening.

Another update for those that might be trying to figure out this stuff in the future.

To setup duplicate mode offsets set the X axis offset to 0 and the U axis offset by the total length of your axis (distance between X stop and U stop).

I cannot figure out a sound method for setting up the mirror mode offsets as I had to just trial and error my way through it (stupid me thinking they'd be the same as the duplicate mode). I found a ratio between the X and -U offsets that add up to the length of my axis and put the tool at X0 U0 through trial and error. My axis is 397.5 and at offsets X150 and U-247.5 the tool position would read 0, but the print heads would still move a little and crash. I then found the offset X165 and U-247.5 that would make it so the tool heads would not move when the tool was changed but the tool position would read 7.5. I learned this tool position could then be offset by any amount without causing crashing issues as long as the same value was subtracted of the X offset and added to the U axis. To find the value I needed to offset this by I took the home position of my T0 (-182.9) and subtracted 7.5 from it getting 190.4. I then subtracted this from my X (165-190.4=-25.4) and added it to my U (-247.5+190.4=-57.1).

I don't understand why this is like this and why this stuff isn't well understood/documented. Are others having the same issues on their IDEX setups or is this my machine specific?

Update- I seem to have figured out how to fix the issue, though I'm still not sure what is causing the issue. I found that by removing the X axis offset in the tool initialization and then offsetting the U axis by the length of the axis (-397.5 in my case) keeps the extruders in the correct places and works as intended.

I have the same slicer setup and though I have been doing most of my troubleshooting just calling the tool from the Web Control, I have also tried running a file using this slicer setup with no success. I think I have narrowed down the problem to the M563 command in config.g defining T2, specifically the mapping of X to both X and U (X0:3). I don't know why this would change the result but I changed this line so that X only mapped to U (X:3), then I changed the tool to T3 with the X still mapped to both X and U and that seemed to work as intended; though, when I try to do a similar thing by selecting T1 first and then T2 with X mapped to X and U I have the same problem. Seeing how this seems to be a firmware issue I might try reinstalling/updating the firmware and seeing if that gets me anywhere.

I am running a new custom IDEX setup but when I change to T2 (Duplicate) and T3 (Mirror) the two printheads just move towards the center of the X-axis and crash. My T0 and T1 work as expected and I have not had any issues with them.

Config.g:
; Configuration file for Duet 3 (firmware version 3)
; executed by the firmware on start-up
;
; generated by RepRapFirmware Configuration Tool v3.2.3 on Wed Jul 07 2021 22:50:05 GMT-0400 (Eastern Daylight Time)

; General preferences
G90 ; send absolute coordinates...
M83 ; ...but relative extruder moves
M550 P"Duet 3" ; set printer name

; Drives
M569 P0.0 S0 ; physical drive 0 goes forwards
M569 P0.1 S1 ; physical drive 1 goes backwards
M569 P0.2 S0 ; physical drive 2 goes forwards
M569 P0.3 S0 ; physical drive 3 goes forwards
M569 P0.4 S1 ; physical drive 4 goes backwards
M569 P0.5 S0 ; physical drive 5 goes forwards
M584 X0.0 Y0.1 Z0.2 U0.3 E0.4:0.5 ; create the U axis and assign stepper driver 3 to it
M350 X16 Y16 Z16 U16 E16 I1 ; configure microstepping with interpolation
M92 X80.00 Y80.00 Z1600.00 U80.00 E408.91 ; set steps per mm
M566 X900.00 Y900.00 Z60.00 U900.00 E120.00 ; set maximum instantaneous speed changes (mm/min)
M203 X6000.00 Y6000.00 Z180.00 U6000.00 E1200.00 ; set maximum speeds (mm/min)
M201 X500.00 Y450.00 Z20.00 U500.00 E250.00 ; set accelerations (mm/s^2)
M906 X1100 Y1300 Z1300 U1100 E1100 I30 ; set motor currents (mA) and motor idle factor in per cent
M84 S30 ; Set idle timeout

; Axis Limits
M208 X-157.5 Y-150 Z0 U-70 S1 ; set axis minima
M208 X157.5 Y150 Z275 U240 S0 ; set axis maxima

; Endstops
M574 X1 S1 P"io4.in" ; Set active X endstops
M574 Y2 S1 P"io6.in" ; Set active Y endstops
M574 U2 S1 P"io5.in" ; Set active U endstops
M574 Z0 ; Set endstops Z controlled by probe

; Z-Probe
M558 P5 I1 R0.4 C"io3.in" H2 F1200 T6000 ; set Z probe type to effector and the dive height + speeds
G31 P500 X14.117 Y32.467 Z2.5 ; set Z probe trigger value, offset and trigger height
M557 X45:300 Y70:295 S50 ; define mesh grid

; Heaters
M308 S0 P"temp0" Y"thermistor" T100000 B4138 ; configure sensor 0 as thermistor on pin temp0
M950 H0 C"out0" T0 ; create bed heater output on out0 and map it to sensor 0
M307 H0 B1 S1.00 ; enable bang-bang mode for the bed heater and set PWM limit
M140 H0 ; map heated bed to heater 0
M143 H0 S120 ; set temperature limit for heater 0 to 120C
M308 S1 P"temp1" Y"thermistor" T100000 B4138 ; configure sensor 1 as thermistor on pin temp1
M950 H1 C"out1" T1 ; create nozzle heater output on out1 and map it to sensor 1
M307 H1 B0 S1.00 ; disable bang-bang mode for heater and set PWM limit
M143 H1 S300 ; set temperature limit for heater 1 to 300C
M308 S2 P"temp2" Y"thermistor" T100000 B4138 ; configure sensor 2 as thermistor on pin temp2
M950 H2 C"out2" T2 ; create nozzle heater output on out2 and map it to sensor 2
M307 H2 B0 S1.00 ; disable bang-bang mode for heater and set PWM limit
M143 H2 S300 ; set temperature limit for heater 2 to 300C

; Fans
M950 F0 C"out9" Q500 ; create fan 0 on pin out9 and set its frequency
M106 P0 S0 H-1 ; set fan 0 value. Thermostatic control is turned off
M950 F1 C"out8" Q500 ; create fan 1 on pin out8 and set its frequency
M106 P1 S0 H-1 ; set fan 1 value. Thermostatic control is turned off
M950 F2 C"out6" Q500 ; create fan 2 on pin out6 and set its frequency
M106 P2 S1 H-1 ; set fan 2 value. Thermostatic control is turned off
M950 F3 C"out5" Q2500 ; create fan 3 on pin out5 and set its frequency
M106 P3 S0 H-1 ; set fan 3 value. Thermostatic control is turned off
M950 F4 C"out4" Q2500 ; create fan 4 on pin out4 and set its frequency
M106 P4 S0 H-1 ; set fan 4 value. Thermostatic control is turned off

; Tools
M563 P0 S"Left Ex" H1 D0 F3 ; define tool 0 (Left Ex)
G10 P0 X-25.438 Y-16.096 Z0 ; set tool 0 axis offsets
G10 P0 R0 S0 ; set initial tool 0 active and standby temperatures to 0C
M563 P1 S"Right Ex" H2 D1 X3 F4 ; define tool 1 (Right Ex)
G10 P1 Y-16.096 Z0 U-54.2 ; set tool 1 axis offsets
G10 P1 R0 S0 ; set initial tool 1 active and standby temperatures to 0C
M563 P2 S"Duplicate" H1:2 D0:1 X0:3 F3:4
G10 P2 X-25.428 Y-16.096 Z0 U-54.2 ; set tool offsets and temperatures
G10 P2 R0 S0
M567 P2 E1:1 ; set mix ratio 100% on both extruders
M563 P3 S"Mirror" H1:2 D0:1 X0:3 F3:4 ; define tool 3 (Mirror Mode)
G10 P3 X-25.428 Y-16.096 Z0 U-54.2 ; set tool 3 axis offsets
G10 P3 R0 S0
M567 P3 E1:1 ; set mix ratio 100% on both extruders

; Custom settings are not defined

; Miscellaneous
M575 P1 S1 B57600 ; enable support for PanelDue

M501

And here are my tool change files for T2 and T3
Tfree2:
M83 ; relative extruder movement
G1 E-2 F3600 ; retract 2mm
M106 S0 ; turn off our print cooling fan
G91 ; relative axis movement
G1 Z3 F500 ; down 3mm
G28 X U ; home the X and U carriages
G1 Z-3 F500 ; up 3mm
G90 ; absolute axis movement

Tfree3:
M579 U1
M83 ; relative extruder movement
G1 E-2 F3600 ; retract 2mm
M106 S0 ; turn off our print cooling fan
G91 ; relative axis movement
G1 Z3 F500 ; down 3mm
G28 X U ; home the X and U carriages
G1 Z-3 F500 ; up 3mm
G90 ; absolute axis movement

Tpost2:
M106 R2 ; restore print cooling fan speed
M116 P2 ; wait for tool 2 heaters to reach operating temperature
M83 ; relative extruder movement
M567 P2 E1:1 ; set tool mix ratio
M568 P2 S1 ; turn on mixing
G1 E2 F3600 ; extrude 2mm from both extruders

Tpost3:
M579 U-1 ; invert U axis direction
M106 R2 ; restore print cooling fan speed
M116 P2 ; wait for tool 2 heaters to reach operating temperature
M83 ; relative extruder movement
M567 P2 E1:1 ; set tool mix ratio
M568 P2 S1 ; turn on mixing
G1 E2 F3600 ; extrude 2mm from both extruders

Tpre files are all blank.
I feel like I'm going crazy trying to debug this as there shouldn't be any move commands called during the tool changes other than the homing commands which work when I change T0 and T1.