For python noobs like me: I uploaded the script into a browser based python implementaition, and it outputs the gcode: http://www.skulpt.org/#

@dc42 for me the benefit of the mmu2 is that it remains direct drive, and doesn't add mass to the X carriage.

@Dougal1957 Because I am using a 4th axis for the xtruder. From the wiki:

"You must specify the XY offsets of the extruder outputs on additional towers relative to machine centre in the M669 command, for example:

M669 X150 Y100"

Anyway, your answer did point me in the right direction. I think I've almost solved it.

After having built a HEVO, and always struggling with the lead screws (somehow the ones I got were always bent) I went looking for something else and stumbled upon the V-King: https://github.com/RoyBerntsenDesign/V-King

I liked the idea of a belted z, and went ahead and built one. I like the simple approach, most extrusions are 500mm. You can buy a kit from ratrig with 12x500mm extrusions, and then you just need some more extrusions for the bed frame (another 4x500mm) and x-axis (480mm). In standard config you get about 340x390 build volume. With the worm gear setup, the bed doesn't drop when power is off.

I first built the original frame and used it. After a few months of use, I decided to do some small modifications: I replaced the openbuilds corners (didn't like m) with 3-way brackets from ebay and added a second z-motor setup. My build volume is now app 340x340 and each corner of the z axis is driven by a belt. I could easliy add an extra one or two z motors and have automatic bed levelling.

Further details:

• Duet Wifi
• 0.9 steppers on x and y
• Bondtech extruder with capricorn bowden
• E3d Chimera+
• Gates belts on x and y
• Minimal use of cloned parts

Below is a pic of the build, and a pic of the first print after the rebuild.

@pro3d It is not what I miss, but you are only providing small bits of information. If you want help from experienced users here, provide the information they ask. So post your whole config.g instead of just parts of it.

From your heater settings, if you have the standard e3d thermistor, these should be the right settings: M305 P1 B4725 C7.060000e-8 (https://e3d-online.dozuki.com/Guide/V6+RepRap+Firmware+Configuration/26?lang=en)

Your setting is different, but I can't tell if this will affect the sensor readings. Maybe others can.

Ok, solved. My M669 was wrong, it is X-100 Y20. Apparantly with Y-20, in combination with the specified 4th axis 'rod length', the probe points were out of reach. Thanks @Danal

@WilcoE said in quality issues with Ender 3 and Duet Wifi:

@bartolomeus said in quality issues with Ender 3 and Duet Wifi:

E30000?

Yes, that was also in my first config post.
Should i change that also to 480?

Not 480, but 30000 is too high. Maybe start with 600 or so for the bmg clone. Actually I don't know the recommend jerk setting for BMG but 30000 is too high.

@Veti the supplier I am looking at has 260mm diameter, 8mm thick plates in both pei coated and natural

@jay_s_uk Thanks. Good to know. However, does this also work with a cast aluminum plate with silicone heater (where to attach the magnets?)

Thanks! I think I'll go for pei coated plate then and try that first. If I run into any problems I could always put a mirror on top . I have had very good luck with 3dlac+mirror for petg but I don't like using clips to hold the mirror in place.

I am looking to upgrade the bed of my delta. The delta has a smart effector, and I was wondering if the print surface has any effect on the precision of the smart effector. I think I once read that a pei coated bed + smart effeector is not a good combo, that's why I am asking.

I am looking at getting a cast aluminum plate with either:

• pei coating directly on the plate
• magnetic sheet on the plate
• mirror on the plate (if I use a mirror, I guess I don't specifically need a cast aluminum plate?)

So, what print surface is a good combo with the smart effector?

Ok, solved. My M669 was wrong, it is X-100 Y20. Apparantly with Y-20, in combination with the specified 4th axis 'rod length', the probe points were out of reach. Thanks @Danal

@Dougal1957 Because I am using a 4th axis for the xtruder. From the wiki:

"You must specify the XY offsets of the extruder outputs on additional towers relative to machine centre in the M669 command, for example:

M669 X150 Y100"

Anyway, your answer did point me in the right direction. I think I've almost solved it.

@Danal I inderstand that, but all points are reachable. How does extruder offset on the 4th axis influence this?

Ok, I noticed the problem after changing the extruder offset for the 4th axis, M669.

When I have: M669 X0 Y0, the probing is normal.
When I change it to: M669 X-120 Y-20, the probing is weird.

I have the M669 command in both config.g as in config-override.g

Is this a bug. or did I misconfigure something?

My config has some strange behaniour while performing delta calibration.
It probes the first point 8 times, then skips some probing points, and continues with the rest of the points. Of the ten outer points, it only probes 6 of them.

My config.g:

; Configuration file for Duet WiFi (firmware version 1.20 or newer)
; executed by the firmware on start-up
;
; generated by RepRapFirmware Configuration Tool on Thu Jun 07 2018 20:41:32 GMT+0200 (West-Europa (zomertijd))

; General preferences
G90                                       ; Send absolute coordinates...
M83                                       ; ...but relative extruder moves

M665 L288.130:288.130:288.130:210 R139.757 H339.583 B117.5 X-0.324 Y-0.215 Z0.000
M666 X-0.675 Y0.465 Z0.210 A-0.03 B0.18
M669 X-120 Y-20

; Network
M550 PKossel                              ; Set machine name
M552 S1                                   ; Enable network
;*** Access point is configured manually via M587
M586 P0 S1                                ; Enable HTTP
M586 P1 S0                                ; Disable FTP
M586 P2 S0                                ; Disable Telnet

; Drives
M584 X0 Y1 Z2 U4 E3
M569 P0 S0                                ; Drive 0 goes backwards
M569 P1 S0                                ; Drive 1 goes backwards
M569 P2 S0                                ; Drive 2 goes backwards
M569 P3 S1                                ; Drive 3 goes forwards
M569 P4 S0				  ; Drive 4 goes backwards (flying extruder)
M350 X16 Y16 Z16 U16 E16 I1               ; Configure microstepping with interpolation
M92 X200 Y200 Z200 U100 E405              ; Set steps per mm
M566 X600 Y600 Z600 U600 E600      	  ; Set maximum instantaneous speed changes (mm/min)
M203 X12000 Y12000 Z12000 U12000 E3600	  ; Set maximum speeds (mm/min)
M201 X1500 Y1500 Z1500 U1500 E2000        ; Set accelerations (mm/s^2)
M906 X1700 Y1700 Z1700 U1000 E1000 I30    ; Set motor currents (mA) and motor idle factor in per cent
M84 S30                                   ; Set idle timeout

; Axis Limits
M208 Z0 S1                                ; Set minimum Z

; Endstops
M574 X2 Y2 Z2 U2 S1                       ; Set active high endstops

; Z-Probe
M558 P8 R0.4 H10 B1 A4 F1200 T3000        ; Set Z probe type to effector and the dive height + speeds, heaters off during probing, multi probe max 10 times
G31 P100 X0 Y0 Z0                         ; Set Z probe trigger value, offset and trigger height
M557 R105 S35                             ; Define mesh grid

; Heaters
M301 H0 S1.00 P10 I0.1 D200 T0.4 W180 B30   ; Use PID on bed heater (may require further tuning)
M305 P0 T100000 B4725 C7.06e-8 R4700        ; Set thermistor + ADC parameters for heater 0
M143 H0 S120                                ; Set temperature limit for heater 0 to 120C
M305 P1 X201				    ; Set PT100 for heater 1
M143 H1 S280                                ; Set temperature limit for heater 1 to 280C

; Fans
M106 P0 S0 I0 F500 H-1                    ; Set fan 0 value, PWM signal inversion and frequency. Thermostatic control is turned off
M106 P1 S1 I0 F500 H1 T45                 ; Set fan 1 value, PWM signal inversion and frequency. Thermostatic control is turned on

; Tools
M563 P0 D0 H1                             ; 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

; Automatic saving after power loss is not enabled

; Custom settings are not configured
M912 P0 S-10 				; CPU temperature calibration

; Miscellaneous
T0                                      ; Select first tool
; G29 S1 				; Load heightmap
; M376 H5		        	; Set bed compensation taper
M207 S1.5 R0 F2400 T1500 Z0		; Firmware retraction for PLA
M572 D0 S0.15				; Pressure advance
M501 					; Run config-override.g

Bed.g:

0:/sys/bed.g
; bed.g file for RepRapFirmware, generated by Escher3D calculator
; 16 points, 6 factors, probing radius: 110, probe offset (0, 0)
G28
G30 P0 X0.00 Y110.00 Z-99999 H0
G30 P1 X70.71 Y84.26 Z-99999 H0
G30 P2 X108.33 Y19.10 Z-99999 H0
G30 P3 X95.26 Y-55.00 Z-99999 H0
G30 P4 X37.62 Y-103.37 Z-99999 H0
G30 P5 X-37.62 Y-103.37 Z-99999 H0
G30 P6 X-95.26 Y-55.00 Z-99999 H0
G30 P7 X-108.33 Y19.10 Z-99999 H0
G30 P8 X-70.71 Y84.26 Z-99999 H0
G30 P9 X0.00 Y55.00 Z-99999 H0
G30 P10 X47.63 Y27.50 Z-99999 H0
G30 P11 X47.63 Y-27.50 Z-99999 H0
G30 P12 X0.00 Y-55.00 Z-99999 H0
G30 P13 X-47.63 Y-27.50 Z-99999 H0
G30 P14 X-47.63 Y27.50 Z-99999 H0
G30 P15 X0 Y0 Z-99999 S6

@garyd9 here it is, nothing special and it doesn't have a tensioning system: https://www.thingiverse.com/thing:3167267