Duet2 - weak Z Axis

SetraX

Hello,
even I have all motors with the same current, I noticed that one (Z) Axis is weak and elastic like rubber. Also the motor is kind of cooler than X and Y.
I only use E0, so my first guess was to unplug Z on board of Duet2 and plug in at E1. I also tried to tell in config.g that now Z is on drive 3... did not work.
Since I have a delta configuration, can I do that?
I had to take the sdcard from the controller and set the config.g back to original since I could not get into DWC anymore to set it back... self destruction ...

; Drives
M569 P0 S1                      ; Drive 0 (X) goes forwards
M569 P1 S1                      ; Drive 1 (Y) goes forwards
M569 P2 S1                      ; Drive 2 (Z) goes forwards
M569 P3 S0                     ; Drive 3 (E0) goes backwards
M584 X0 Y1 Z2 E3							; X on motor0, Y on motor1, Z on motor2, E0 on motor4
M350 E128 I1								; Configure microstepping without interpolation
M350 X128 Y128 Z128 I1 						; Configure microstepping with interpolation
M92 X640 Y640 Z640 E1100 					; Set steps per mm
M566 X500 Y500 Z500 E50 				    ; Set maximum instantaneous speed changes (mm/min)
M203 X10000 Y10000 Z10000 E5000 			; Set maximum speeds (mm/min)
M201 X2500 Y2500 Z2500 E1000			    ; Set accelerations (mm/s^2)
M906 X1600 Y1600 Z1600 E1500 I35 			; Set motor currents (mA) and motor idle factor in per cent

this is my config.g

All the best and maybe we can figure something out... Thx

Phaedrux

Please post your full config.g and the results of sending M122 and M98 P"config.g"

Can you confirm that after swapping motors and remapping drivers you had the same problem? Or were you not able to get the swap to work? It's not entirely clear from your post.

SetraX

@Phaedrux Well after "unbelieving" that stepper motors if they work do not have a problem I learned it the hard way. Two motors had a play (about 0.5° and almost 0.75°). This is unbelievable. I'm so reality checked now.

This issue must have occured as I crashed the bed quiet a few times that the inner structure of my motors did loosen and created a play and I could never get same results. Also the noise of the moving machine changed into a humming. Before it had some tingeling (like a screw loose somewhere-could not chase it down to the source).

Also I changed every component:
RODS - Rod joints
BLTOUCH - CRTOUCH
Electronics, Drivers, even I shorted all cables to the minimum
I changed the buildplate to get a more even one
I changed the hotend
I chanaged the extruder ( I do not regret this one - now LDO Orbiter V2)
Yes also I upgraded to linear Rails with carriages...
Changed the belts to steel enforced belts...
The number of nozzles I changed I stopped counting (crash or hard touch and change)

Anyway not much more to change left besides the motors
Now the printer spits out results .... I'm so happy

Still a few issues with automation - and multiprobe, but I will get to that later

All the best and thank you

Phaedrux

@SetraX said in Duet2 - weak Z Axis:

Changed the belts to steel enforced belts...

Steel core belts are not recommended for the tight bend radius usually used in 3d printer drives. The steel cores will fatigue and break and the belts will then stretch.