@o_lampe Something like this?

@o_lampe I have been wondering about a core xz mod for it. However I do not want to lose auto tramming Z! Do you have any thoughts on that?

So the way I have my z steppers hooked up the whole x axes hangs on it rather than pushing on it, does this make a difference?
this is how I plan to fix it I will a add linear bearings for the blue lines and then somehow mount the linear bearing cars to the x in a way that it can pivot so it can move independently.

After more testing I Think I am getting z binding on both sides. This would explain why the artifacts do not travel straight through the part but rather make separate patterns on the wall closest to their respective sides while leaving the center looking ok.

@Phaedrux
I think these like pretty good.

"What's the smallest Z step your printer can do?" To be honest I am not sure! they are just stock ender 3 stepper Moters. If it is something mechanical, I am not sure how it is consistent enough to travel up the side of the part like that.

@DIY-O-Sphere I did not even realize I had bang bang on the bed! That would fit with the idea that the layer time effects it. I printed that gear in vase mode, and it was very good. I also tried a Prusa slicer, no change.

@mikeabuilder
If forgot to say it only happens on larger models so I think the z axes can be ruled out.
I use cura so maybe i should try Prusa slicer. Thanks for your ideas!

@Phaedrux
It is a bmg with Bowden.

Do you guys have any idea what is causing theses lines. they seem to travel diagonal on the y axes and then leave a small level layer shift only on the x axes. It is on a modded ender 3 with duet 5 mini.
I am not sure whether to blame hardware or software.

; Configuration file for Duet 3 Mini 5+ (firmware version 3.3)
; executed by the firmware on start-up
;
; generated by RepRapFirmware Configuration Tool v3.3.13 on Wed Oct 12 2022 17:23:19 GMT-0500 (Central Daylight Time)

; General preferences
G90                                                ; send absolute coordinates...
M83                                                ; ...but relative extruder moves
M550 P"Ender 3 Ultra"                              ; set printer name
M918 P1 E4 F2000000                                ; configure direct-connect display

; Network
M552 S1                                            ; enable network
M586 P0 S1                                         ; enable HTTP
M586 P1 S0                                         ; disable FTP
M586 P2 S0                                         ; disable Telnet

; Drives
M569 P0.0 S1                                      ; physical drive 0.0 goes backwards
M569 P0.1 S0                                       ; physical drive 0.1 goes backwards
M569 P0.2 S0                                       ; physical drive 0.2 goes backwards
M569 P0.3 S0                                       ; physical drive 0.3 goes b
M569 P0.4 S0                                       ; physical drive 0.4 goes backwards
M671 X-50:270 Y0:0 S10                             ; define dual driven z-axis 
M584 X0.4 Y0.1 Z0.0:0.2 E0.3                           ; set drive mapping
M350 X16 Y16 Z16 E16 I1                            ; configure microstepping with interpolation
M92 X80.6755 Y80.00 Z400 E406.86275           ; set steps per mm
M566 X400 Y400 Z60.00 E300.00                ; set maximum instantaneous speed changes (mm/min)
M203 X6000.00 Y6000.00 Z600.00 E3600.00            ; set maximum speeds (mm/min)
M201 X500 Y500 Z200.00 E500           ; set accelerations (mm/s^2)
M906 X1300 Y1400 Z700 E900 I30                      ; set motor currents (mA) and motor idle factor in per cent
M84 S30                                            ; Set idle timeout

; Axis Limits
M208 X0 Y0 Z0 S1                                   ; set axis minima
M208 X205 Y220 Z260 S0   ; set axis maxima
M206 X0 Y20 Z0
; Endstops
M574 X1 S1 P"io5.in"                               ; configure switch-type (e.g. microswitch) endstop for low end on X via pin io5.in
M574 Y1 S1 P"io6.in"                               ; configure switch-type (e.g. microswitch) endstop for low end on Y via pin io6.in
M574 Z1 S2                                         ; configure Z-probe endstop for low end on Z

; Z-Probe
M950 S0 C"io3.out" ; create servo pin 0 for BLTouch
M558 P9 C"io3.in" H5 F120 T6000 ; set Z probe type to bltouch and the dive height + speeds
G31 P500 X0 Y-20.701 Z3.895 ; set Z probe trigger value, offset and trigger height
M556 S50 X0 Y0 Z0 ; set orthogonal axis compensation parameters
M557 X10:200 Y10:210 s60:60 ; define me

; Heaters
M308 S0 P"temp0" Y"thermistor" T100000 B4092       ; 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 S180                                       ; set temperature limit for heater 0 to 180C
M308 S1 P"temp1" Y"pt1000"                         ; configure sensor 1 as PT1000 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 S450                                       ; set temperature limit for heater 1 to 450C
M308 S2 P"temp2" Y"thermistor" T100000 B4092       ; configure sensor 2 as thermistor on pin temp2
M950 H2 C"out2" T2                                 ; create chamber heater output on out2 and map it to sensor 2
M307 H2 B1 S50                                   ; enable bang-bang mode for the chamber heater and set PWM limit
M141 H2                                            ; map chamber to heater 2
M143 H2 S100                                       ; set temperature limit for heater 2 to 100C

; Fans
M950 F0 C"out3" Q150                               ; create fan 0 on pin out3 and set its frequency
M106 P0 C"part fan " S0 H-1                        ; set fan 0 name and value. Thermostatic control is turned off
M950 F1 C"out4" Q500                               ; create fan 1 on pin out4 and set its frequency
M106 P1 C"hotend fan" S1 H1:2:0 T45                ; set fan 1 name and value. Thermostatic control is turned on
M950 F2 C"out5" Q500                               ; create fan 2 on pin out5 and set its frequency
M106 P2 C"mother bourd" S1 H1:2:0 T45              ; set fan 2 name and value. Thermostatic control is turned on

; Tools
M563 P0 S"Copperhead" D0 H1 F0                     ; define tool 0
G10 P0 X0 Y0 Z0                                    ; set tool 0 axis offsets
G10 P0 R0 S0                                       ; set initial tool 0 active and standby temperatures to 0C

; Custom settings are not defined

; Miscellaneous
M501                                               ; load saved parameters from non-volatile memory
M911 S22 R23 P"M913 X0 Y0 G91 M83 G1 Z3 E-5 F1000" ; set voltage thresholds and actions to run on power loss
T0                                                 ; select first tool

M955 P0 C"spi.cs2+spi.cs1" ; all wires connected to temp DB connector, no temperature daughterboard
M572 D0 S.6

M556 S100 X-0.2 ;skew adjust
;M593 P"EI3" F40 ; use ZVD input shaping to cancel ringing at 40.5Hz
M376 H10
M304 P32.8 I.706 D111.9
M575 P1 S1 B57600;screen code