@Phaedrux I will for sure give this a shot, but im 99% sure its not due to the weight. The weight has never been an issue before, its only when the bed is at the bottom. If I try to "hold" the bed with my finger below it when it has no current I can simply hold my finger there without giving any preassure and it stays.

@droftarts This sounds like the solution! After changing parts on the printer lately I have for sure gained more Z travel and I intentinally set that limits to be lower earlier as the bed struggled when going all the way down(slightly skewed Z rods).

I will post back in a couple of minutes with an edit

Edit: It was the Z axis limit that caused this. Now it works as intended even at the lowest point it can reach. I did not think about this at all until I read out your message

Thanks alot to both of you! Im starting to get close to a result I can be happy with

Alright, so it looks like it was an issue with the 3DTouch. I bought a BLTouch and got it installed today. So far no steps have been skipped!

A little update on this issue:

I have finally swapped out all the parts for the X and Y axis and extended the Z axis to be able to reach the hotend. All in all these new parts feel alot more sturdy and well designed compared to the old parts I had.

I did manage to model up a new mount for the Zesty Nimble im using. As im impatient I gave it a go in 123D Design and it worked out OK. I did not scale the mount holes up enough so it did not fit perfectly. Nothing the dremel couldnt fix...

I had some issues fitting the parts together after snapping the hotend into its place as the part expanded a bit due to the preassure. I ended up breaking off some of the model to actually make it fit. The hotend sits sturdy even without the part I broke off.

The whole setup does not look too nice, but it works. I will try to make it look better with the time.

So, back to the dimensions:

I have only printed a few calibration cubes and will have to do some more tests the following days, but so far it looks promising. The two cubes I have printed came out as 20.05x20.05mm and 20.05x20.05mm, so both came out with identical dimensions. I will print the calibration hexagon tomorrow.

Even though the parts seem better now I still noticed that the belts going for the XY idlers to the hotend itself still seems a bit off like the old setup, though not as much.

@dc42 I will update the firmware right away. Been a while sinse I updated last.

Thanks alot for the explanation. You were 100% right! I was a bit too quick to overlook that

It triggered right away when I reduced the H parameter.

Thanks again

Hello!

I have a modified Ender 3 V2 that is facing some issues with the sides of its prints and I can't wrap my head around whats causing it.

The machine has the following mods:

• Duet Wifi 2
• BLTouch sensor
• Linear rail on the Y axis
• Belts on the Z axis
• Zesty Nimble extruder
• Changed out belt idlers with toothed idlers/pulleys

Other info:

• 0.4 Nozzle
• 0.2 layer height
• Im using Simplfy3D V5

The problem:
I am trying to print a 20x40mm cube with 1 bottom layer, 1 perimeter, 0 top layers and 0% infill. This is only printing a hollow cube - and its this cube im struggling with stripes on the side of.

If im printing with extrusion width at 0.4 im getting this result(horizontal lines, but the lines are not fully lining up with each layer):

If im printing with extrusion width set to auto and enable "adaptive layer heights" in Simplfy3D im getting this result(Way less stripes, but they are now physically more visible and they are more vertical than horizontal):

I have tried the following:

• PID tuned both bed and extruder
• Calibrated extruder steps
• Calibrated XY steps
• Checked GT2 belts
• Checked the Z/X wheels
• Checked that all axis's can move freely
• Tried with printing speeds from 2000-4800mm/s without any noticable diffrence
• Tried with acceleration from 300-1200mm/s without any noticable diffrence
• Swapped out the GT2 idlers for toothed pulleys/idlers

Current duet config:

; Configuration file for Duet WiFi (firmware version 3)
; executed by the firmware on start-up
;
; generated by RepRapFirmware Configuration Tool v3.3.0 on Thu Aug 05 2021 18:21:51 GMT+0200 (sentraleuropeisk sommertid)

; General preferences
M575 P1 S1 B57600                              ; enable support for PanelDue
G90                                            ; send absolute coordinates...
M83                                            ; ...but relative extruder moves
M550 P"Ender 3 V2"                             ; set printer name
M918 P1 E4 F2000000                            ; configure direct-connect display

; Drives
M569 P0 S0                                     ; physical drive 0 goes backwards
M569 P1 S0                                     ; physical drive 1 goes backwards
M569 P2 S0                                     ; physical drive 2 goes backwards
M569 P3 S0                                     ; physical drive 3 goes backwards
M569 F11 P0										; set X motor CHOPCONF to 11
M569 F1 P2										; set Z motor CHOPCONF to 5
M584 X0 Y1 Z2 E3                               ; set drive mapping
M350 X16 Y16 Z16 E16 I1                        ; configure microstepping with interpolation
M92 X80.00 Y80.00 Z400.00 E2700             ; set steps per mm
M566 X300.00 Y300.00 Z60.00 E40.00         ; set maximum instantaneous speed changes (mm/min)
M203 X4000.00 Y4000.00 Z300.00 E10000.00      ; set maximum speeds (mm/min)
M201 X600.00 Y600.00 Z60.00 E120.00           ; set accelerations (mm/s^2)
M906 X600 Y600 Z600 E600 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 X220 Y220 Z250 S0                         ; set axis maxima

; Endstops
M574 X1 S1 P"xstop"                            ; configure active-high endstop for low end on X via pin xstop
M574 Y1 S1 P"ystop"                            ; configure active-high endstop for low end on Y via pin ystop
M574 Z1 S2                                     ; configure Z-probe endstop for low end on Z

; Z-Probe
M950 S0 C"exp.heater3"                         ; create servo pin 0 for BLTouch
M558 P9 C"^zprobe.in" H5 F120 T6000            ; set Z probe type to bltouch and the dive height + speeds
G31 P500 X30.3 Y2.4 Z2.9                       ; set Z probe trigger value, offset and trigger height
M557 X31:215 Y15:195 S20                       ; define mesh grid

; Heaters
M308 S0 P"bedtemp" Y"thermistor" T100000 B4092 ; configure sensor 0 as thermistor on pin bedtemp
M950 H0 C"bedheat" T0                          ; create bed heater output on bedheat and map it to sensor 0
M307 H0 R0.261 K0.249:0.000 D3.43 E1.35 S1.00 B0    ; disable bang-bang mode for the bed heater and set PWM limit
M140 H0                                        ; map heated bed to heater 0
M143 H0 S110                                   ; set temperature limit for heater 0 to 110C
M308 S1 P"e0temp" Y"thermistor" T100000 B4092  ; configure sensor 1 as thermistor on pin e0temp
M950 H1 C"e0heat" T1                           ; create nozzle heater output on e0heat and map it to sensor 1
M307 H1 R2.780 K0.479:0.000 D6.30 E1.35 S1.00 B0 V24.3     ; disable bang-bang mode for heater  and set PWM limit
M143 H1 S255                                   ; set temperature limit for heater 1 to 255C

; Fans
M950 F0 C"fan0" Q250                           ; create fan 0 on pin fan0 and set its frequency
M106 P0 S0 H-1                                 ; set fan 0 value. Thermostatic control is turned off
M950 F1 C"fan1" Q500                           ; create fan 1 on pin fan1 and set its frequency
M106 P1 S1 H1 T45                              ; set fan 1 value. Thermostatic control is turned on
M950 F2 C"fan2" Q500                           ; create fan 2 on pin fan2 and set its frequency
M106 P2 S1 H1:0 T45                            ; set fan 2 value. Thermostatic control is turned on

; Tools
M563 P0 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

I was pretty sure it would be something mechanical, but at the moment im starting to run out of ideas of what might be the cause. Next on the list would be trying some other stepper motors to rule out any electrical noise. If anyone has any better ideas im all ears!

@droftarts Aha, I see.

The probe did trigger. The bed kept moving until it hit the probe no matter how far down it was. It did not stop at the bottom, it kept on going and grinding the motors.

@droftarts I have about 290-300mm travel in total on the Z axis. I sat the new limit to 280mm which works fine.

Hehe yeah, it looks like it. As long as you set the limits to match the travel length you will never experience this, but if someone for some reason put the limits on 50% of the travel length I belive you would.

@Phaedrux I will for sure give this a shot, but im 99% sure its not due to the weight. The weight has never been an issue before, its only when the bed is at the bottom. If I try to "hold" the bed with my finger below it when it has no current I can simply hold my finger there without giving any preassure and it stays.

@droftarts This sounds like the solution! After changing parts on the printer lately I have for sure gained more Z travel and I intentinally set that limits to be lower earlier as the bed struggled when going all the way down(slightly skewed Z rods).

I will post back in a couple of minutes with an edit

Edit: It was the Z axis limit that caused this. Now it works as intended even at the lowest point it can reach. I did not think about this at all until I read out your message

Thanks alot to both of you! Im starting to get close to a result I can be happy with

I have just updated my firmware to 3.1.1 so here is my new config file. Im still having the same issue on this firmware. For what its worth I sat up the setup with the online generator.

; Configuration file for Duet WiFi (firmware version 3)
; executed by the firmware on start-up
;
; generated by RepRapFirmware Configuration Tool v3.1.4 on Fri Aug 14 2020 12:18:48 GMT+0200 (sentraleuropeisk sommertid)

; General preferences
G90                                              ; send absolute coordinates...
M83                                              ; ...but relative extruder moves
M550 P"Jarans HEVO"                              ; set printer name
M669 K1                                          ; select CoreXY mode

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

; Drives
M569 P0 S1                                       ; physical drive 0 goes forwards
M569 P1 S1                                       ; physical drive 1 goes forwards
M569 P2 S1                                       ; physical drive 2 goes forwards
M569 P3 S1                                       ; physical drive 3 goes forwards
M584 X0 Y1 Z2 E3                                 ; set drive mapping
M350 X16 Y16 Z16 E16 I1                          ; configure microstepping with interpolation
M92 X80.00 Y80.00 Z400.00 E2771.50               ; set steps per mm
M566 X480.00 Y480.00 Z24.00 E40.00               ; set maximum instantaneous speed changes (mm/min)
M203 X6000.00 Y6000.00 Z400.00 E10000.00         ; set maximum speeds (mm/min)
M201 X500.00 Y500.00 Z200.00 E120.00             ; set accelerations (mm/s^2)
M906 X1200 Y1200 Z800 E800 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 X267 Y267 Z250 S0                           ; set axis maxima

; Endstops
M574 X1 S3                                       ; configure sensorless endstop for low end on X
M574 Y1 S3                                       ; configure sensorless endstop for low end on Y
M574 Z1 S2                                       ; configure Z-probe endstop for low end on Z

; Stall Detection
M915 X Y S3 F0 H100 R0

; Z-Probe
M950 S0 C"exp.heater3"                           ; create servo pin 0 for BLTouch
M558 P9 C"^zprobe.in" H5 F120 T6000              ; set Z probe type to bltouch and the dive height + speeds
G31 P25 X28 Y3 Z3.636                            ; set Z probe trigger value, offset and trigger height
M557 X30:260 Y30:260 S40.4                       ; define mesh grid

; Heaters
M950 H3 C"nil"                                   ; Disable heater H3 to free up pin
M308 S0 P"bedtemp" Y"thermistor" T100000 B4138   ; configure sensor 0 as thermistor on pin bedtemp
M950 H0 C"bedheat" T0                            ; create bed heater output on bedheat and map it to sensor 0
M307 H0 B0 S1.00                                 ; disable 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"e0temp" Y"thermistor" T100000 B4725 C7.06e-8 R4700 ; configure sensor 1 as thermistor on pin e0temp
M950 H1 C"e0heat" T1                             ; create nozzle heater output on e0heat and map it to sensor 1
M307 H1 B0 S1.00                                 ; disable bang-bang mode for heater  and set PWM limit

; Fans
M950 F0 C"fan0" Q500                             ; create fan 0 on pin fan0 and set its frequency
M106 P0 S0 H-1                                   ; set fan 0 value. Thermostatic control is turned off
M950 F1 C"fan1" Q500                             ; create fan 1 on pin fan1 and set its frequency
M106 P1 S1 H1 T45                                ; set fan 1 value. Thermostatic control is turned on

; Tools
M563 P0 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
M575 P1 S1 B57600                                ; enable support for PanelDue

@dc42 I will update the firmware right away. Been a while sinse I updated last.

Thanks alot for the explanation. You were 100% right! I was a bit too quick to overlook that

It triggered right away when I reduced the H parameter.

Thanks again

@dc42 Im running it on 3600.

My homing file looks like this:

; homeall.g
; called to home all axes
;

M400                    	; make sure everything has stopped before we make changes
M913 X50 Y50	       		; reduce motor current to 50% to prevent belts slipping
G91                     	; use relative positioning
G1 S1 X-400	F3600	 		; move back 400mm, stopping at the endstop
G1 X5	           			; move away from home
G1 S1 Y-400 F3600		 	; move back 400mm, stopping at the endstop
G1 Y5	           			; move away from home
G1 S1 X-400	F3600			; move towards axis minimum
G1 S1 Y-400	F3600			; move towards axis minimum 
G1 X5 Y60	                ; move away from home
G92 X0 Y0					; set coordinates to 0,0
M400                    	; make sure everything has stopped before we reset the motor currents
M913 X100 Y100		     	; motor currents back to normal

;G90                     	; absolute positioning
;G1 X0 Y60 F6000          	; go to first bed probe point and home Z
;G30                     	; home Z by probing the bed

M915 reports:

M915
Driver 0: stall threshold 3, filter off, steps/sec 300, coolstep 0, action: none
Driver 1: stall threshold 3, filter off, steps/sec 300, coolstep 0, action: none
Driver 2: stall threshold 1, filter off, steps/sec 200, coolstep 0, action: none
Driver 3: stall threshold 1, filter off, steps/sec 200, coolstep 0, action: none
Driver 4: stall threshold 1, filter off, steps/sec 200, coolstep 0, action: none

Hello! I have been doing some calibrations on my CoreXY printer and I have ran into some issues with my sensorless homing setup.

I simply can't get the stall detection to work after changing the steps/mm on each motor for X and Y.

I used this before the calibration:

M92 X80.00 Y80.00 Z400.00 E2771.50

And changed it to this:

M92 X79.24 Y79.64 Z400.00 E2771.50

Stall detection settings:

M915 X Y S3 F0 H300 R0

The stall detection works perfect with 80 steps/mm but with the lower ones(79.**) does not make the stall detection trigger at all. I have tried to change up the S parameter all the way down to -50 but there are no visible changes. The motors drag the extruder to the end of its axis and the belts start slipping.

I can't find anything about this in the limitations section of stall detection. Is there anything im missing here?

Thanks!

Hehe, I should indeed speed it up! Thanks for the little snippet

I am going to home in the middle of the printer once im done making changes. Been struggling with the printed parts and lining up the belt so I have taken it all apart quite a few times now. The last setup I had the extruder never moved outside the buildplate, but the new parts allows it to move out of it in the Y axis. Thanks for the tip. At the moment the extruder can only move within its buildplate, but I am going to allow it to move out of it later on to make some sort of nozzle wiping brush.

I made a little video of the issue. Please excuse the mess

https://streamable.com/ild3we