Ok, added parameter S2 on the lines in my slicer scripts where U is mentioned, no problems with printing this file so far

Have this in the start script
; move to heating position
G1 X78 U108 Y200 F6000 S2
G1 X78 U108 Y240 F6000 S2

No Ajax timeout! No communication problems no more

Oh' ok.. I'll check whatever is in my slicer scripts where it mentions U axis
..

And it timeouts again, I'm beginning to suspect that this is a U axis endstop problem, Have to check my slicer start scripts

You nailed it! must have been that the U endstop was active in the parking position, seems this is a bug (feature?) in 1.19

Yes, it is a cartesian printer (bigbox duex conversion)

Btw, have not had any ajax problems for the whole day, but have not tried a print yet.. (will do hat now)

As for the U axis problem, I can not understand this..

First tpost1.g (U-axis):

G1 U305 Y240 F6000 ; move back
G1 U108 Y240 F6000 ; move to dock
M116 P1 ; wait for tool 1 heaters to reach operating temperature
M83 ; relative extruder movement
G1 F75 ; set feedrate 75mm/min
G1 E10 ; extrude 10mm
G1 F50 ; set feedrate 50mm/min
G1 E5 ; extrude 5mm
G1 F3600 ; set feedrate 3600mm/min
G1 E-1.5 ; retract 1.5mm
G1 U108 Y200 F6000 ; wiping movement
G1 U108 Y240 F6000 ; wiping movement
G1 U108 Y200 F6000 ; wiping movement

Compare to tpost0.g (X-axis):
G1 X-5 Y240 F6000 ; move back
G1 X78 Y240 F6000 ; move to dock
M116 P0 ; wait for tool 0 heaters to reach operating temperature
M83 ; relative extruder movement
G1 F75 ; set feedrate 75mm/min
G1 E10 ; extrude 10mm
G1 F50 ; set feedrate 50mm/min
G1 E5 ; extrude 5mm
G1 F3600 ; set feedrate 3600mm/min
G1 E-1.5 ; retract 1.5mm
G1 X78 Y200 F6000 ; wiping movement
G1 X78 Y240 F6000 ; wiping movement
G1 X78 Y200 F6000 ; wiping movement

When I select tool1, it heats and primes in U305Y240, even wipe movement is at U305, it starts to print after that. Tool 0 behaves as it should (heats and primes in ooze/wipe area) This happens even when selecting tool on the paneldue so it is not a slicer problem.

This all worked ok with 1.18.. Have not touched tpost, tfree or config.g.. hm..

Tried fixed channel on my router, but that did not help at all. The U axis problem could be a slicer script issue? will dig deeper into that after checking the toolchange macros, bit to frustrated at the moment..

Seems to be not a problem with the connection as such, as if the machine is idle, I have no problems with disconnects. Problems starts when printing..

Can't get this to work on my duet wifi, Ajax timeouts all the time even after setting ajax retries to 10 and update intervall at 1000ms. I have not moved the machine or router..it also seem to have messed my tool changes. (bigbox Idex). U axis is behaving very strange, it is priming in it's standby space.

I'm going back to 1.18.. Sorry…

Print fans working ok now! Had a bad solder on print fan assigned to P0, so for *difficult" pwm fans, do use P0 to P3.. For full on fans like extruder cooling fans, I guess the duex pins are ok (runs at full speed when needed)

Assigned fans like this now:

M106 P0 F10 ; Part cooling fan (P0 is PWM Fan 0 on duet wifi, 10Hz)
M106 P1 S255 T45 H1 ; Trigger hotend 1 (left) fan at 45C (P1 is PWM Fan 1 on Duet WiFi)
M106 P2 F10 ; Part cooling fan (P2 is PWM Fan 2 on duet wifi, 10Hz)
M106 P3 S255 T45 H2 ; Trigger hotend 2 (right) fan at 45C (P3 is PWM Fan 3 on Duex)

And this works much better, at least with print fan P2, the other one (that I have assigned to P0) seems faulty (could be the fan)
So it seems that pwm freqency is not settable in this way on the duex board?

Hi all!

Having problems with print fans on my idex setup. I have a duex2 expansion board and want to use pwm fan 3 and 4 on the duex for those
Had my fan allocation set up like this:

; *** Assign Fan Channels
M106 P0 S255 T45 H1 ; Trigger hotend 1 (left) fan at 45 C (P0 is PWM Fan 0 on the Duet WiFi)
M106 P1 S255 T45 H2 ; Trigger hotend 2 (right)fan at 45 C (P1 is PWM Fan 1 on the Duet WiFi)
M106 P3 F10 ; Part cooling fan (P3 is PWM Fan 3 on the Duex2 10Hz)
M106 P4 F10 ; Part cooling fan (P4 is PWM fan 4 on the Duex2 10Hz)

I suppose I use difficult 24V 20x40x40 fans (bigbox parts) but it does not matter what F parameter I use, the fans stop at anything less than M106 S255
M106 S254 makes them stop.. When I used only one print fan before I converted to idex i used one of the pwm ports on the duet wifi and that worked great at F10

Duex voltage jumper is set for Vin (24V)

Is the pwm frequency settable at all on the duex board? or have I made a wiring misstake…

Cheers!

/Björn