Hey group, I've been using the Duet Wifi to drive a dual x-axis lead screw 3d printer with a fixed bed and moving gantry. It's been working out great. Most people don't like the idea of a lead screw 3d printer because of backlash and speed issues. But I've been using high helix multi-start screw with anti backlash nuts and the machine performs. Attached is a copy of my firmware files. Also I published everything opensource on Thingiverse if anyone wants to try to build one themselves. I do suggest using the expansion board on this build to help with mesh leveling. We usually run an auto-level routine before mesh leveling to get the dual z-axis gantry parallel followed by a mesh leveling routine.

Here's the Config:
; 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 Nov 16 2017 18:16:14 GMT-0600 (Central Standard Time)

M111 S0 ; Debugging off
G21 ; Work in millimetres
G90 ; Send absolute coordinates...
M83 ; ...but relative extruder moves
M555 P1 ; Set firmware compatibility to look like RepRapFirmare

; Motor remapping for dual X
;M584 X0:3 Y1 Z2 U3 E4 P3 ; Driver X0:3, 1 for Y, Z=2 U=3, Extruder 4; General preferences
;Motor remapping with U axis visible
M584 X0:3 Y1 Z2:9 U3 E4 ; Driver X0:3, 1 for Y, Z2:9 , , U=3, Extruder 4; General preferences

; LEADSCREW POSTIONS
M671 X-115:650 Y150:150 S5.0;

;oldfirmwareM911 S10 R11 P"M913 X0 Y0 G91 M83 G1 Z3 E-5 F1000"'
M911 S22 R25.0 P"M913 X0 Y0 G91 M83 G1 Z3 E-5 F1000"
M208 X0 Y0 Z0 U0 V0 S1 ; Set axis minima
M208 X600 Y300 Z235 U600 V210 S0 ; Set axis maxima

; Endstops
M574 X1 Y2 Z2 U1 S1 ; Set active high endstops
M558 P3 I1 H10 F600 T6000 ; Set Z probe type to switch and the dive height + speeds
G31 P500 X15 Y15 Z0.6 ; Set Z probe trigger value, offset and trigger height
M557 X20:480 Y20:300 S40 ; Define mesh grid

; Drives
M569 P0 S1 ; Drive 0 goes X1 forwards
M569 P1 S0 ; Drive 1 goes Y forwards
M569 P2 S0 ; Drive 2 goes Z forwards
M569 P3 S1 ; Drive 3 goes X2 forwards
M569 P4 S0 ; Drive 4 goes E fowards
M569 P5 S1 ;
M569 P6 S0 ;
M569 P7 S1 ;
M569 P8 S1 ;
M569 P9 S0 ; Drive 9 goes Z2 forward

; Configure Drives
M350 X16 Y16 Z16 U16 V16 E16 I1 ; Configure microstepping with interpolation
M92 X64 Y64 Z1259.843 U64 V1259.843 E418.5 ; Set steps per mm
M566 X1200 Y1200 Z12 U1200 V12 E120 ; Set maximum instantaneous speed changes (mm/min)
M203 X7200 Y7200 Z180 U7200 V180 E1200 ; Set maximum speeds (mm/min)
M201 X500 Y500 Z250 U500 V250 E250 ; Set accelerations (mm/s^2)
M906 X2300 Y2300 Z1400 E1200 U2300 V1400 I30 ; Set motor currents (mA) and motor idle factor in per cent
M84 S30 ; Set idle timeout

; Heaters
M140 H-1 ; Disable heated bed
M305 P1 T100000 B4725 C7.060000e-8 R4700 ; Set thermistor + ADC parameters for heater 1
M143 H1 S280 ; Set temperature limit for heater 1 to 280C

; Tools
M563 P0 D0 H1 ; Define tool 0
G10 P0 X0 Y0 U0 V0 Z0 ; Set tool 0 axis offsets
G10 P0 R0 S0 ; Set initial tool 0 active and standby temperatures to 0C

; Network
M550 PWorkhorse ; Set machine name
M552 S1 ; Enable network S1 router s2 hotspot
; Access point is configured manually via M587 by the user
M586 P0 S1 ; Enable HTTP
M586 P1 S0 ; Disable FTP
M586 P2 S0 ; Disable Telnet

; SetNetwork macro to set up access to dummy test Wifi network
;M552 S0;
;G4 S5;
;M589 "network name" P"password" I192.168.1.117;
;G4 S5;
;M552 S2;

; Fans?
M106 P0 S1 I0 F500 H-1 ; Set fan 0 value, PWM signal inversion and frequency. Thermostatic control is turned off
M106 P1 S1 I0 F500 H-1 ; Set fan 1 value, PWM signal inversion and frequency. Thermostatic control is turned off
M106 P2 S1 I0 F500 H-1 ; Set fan 2 value, PWM signal inversion and frequency. Thermostatic control is turned off

; Custom settings are not configured

; Miscellaneous
M501 ; Load saved parameters from non-volatile memory
T0 ; Select first tool

Here's the HomeX:
; homex.g
; called to home the X axis
;
; generated by RepRapFirmware Configuration Tool on Thu Nov 16 2017 18:16:14 GMT-0600 (Central Standard Time)

; Lift Z relative to current position
G91
G1 S2 Z5 F2000
G90

; Move quickly to X axis endstop and stop there (first pass)
M584 X0 U3 ; Split X into 2 (X+U)
G1 S1 X-605 U-605 F1500

; Go back a few mm
G91
G1 S2 X5 U5
G90

; Move slowly to X axis endstop once more (second pass)
G1 S1 X-605 U-605 F360

M584 X0:3 ; Join U to X again

; Go back a few mm
G91
G1 S2 X5 U5
G90

; Lower Z again
G91
G1 S2 Z-5 F2000
G90
;;;;

https://www.thingiverse.com/thing:2764064
https://www.3ddistributed.com/
https://www.youtube.com/watch?v=afbCD0LzNQE&t=100s

link text
0_1539724921203_config.g 0_1539724934829_homeall.g 0_1539724938661_homex.g 0_1539724952377_homey.g 0_1539724957522_homez.g

@dc42 Ok so I need to wire one of the Duet servo outputs to the brushless motor's driver AVI and use a common ground between the Duet and the motor driver. So according to this illustration

the servo connectors are the same pins as used for the stepper endstops? Or should I be wiring to the expansion header as stated in the "Using servos and controlling unused IO pins" documentation? Also do think I still need the 220uF capacitor on the 5v rail for back emf?

@dc42 Yeah it was pricey but my customer is paying for it. It's going on a 3 axis robot arm thats attached to an electric crane to print houses. We're just in proof of concept stage right now. I'm using the breakout expansion header. I'm just trying to use the Duet Wifi to turn on the rotary which will be ALWAYS ON, then run jog the print around while the rotary stays on and cycle through a series of macros. Think of the rotary as a giant fan but instead of blowing air it sprays concrete. It would be nice if I can make a button on the web interface to turn on the rotary and have it stay on while I execute other macros and jog the other three axis around without the rotary stopping. After we get a proof of concept we'll get more money to develop it further. Long term I'm going to need a CAN bus to interface with the electric crane to automate the crane motion. Do yall do custom boards by any chance. I heard that the next Duet Wifi board coming out will have a CAN bus connection.

@dc42 Hey I bought this Nema 34 brushless motor and driver off Amazon. https://www.amazon.com/gp/product/B07H29S6DS/ref=oh_aui_detailpage_o02_s00?ie=UTF8&psc=1

Do you think I can wire the fan pins to the enable of the driver to turn it on with the fan control?

Also is there a way to rename the jog buttons (X.1, X1.)?

@dc42 Yeah I have been thinking about that. Someone just informed me that I can actually use a stepper motor with PWM like a brushless motor. This might be more ideal for me because I already have the Nema34 and machined parts to mount the nema34. I'm not sure if this would work but I might give it a try.

Hey group, I'm using the Duet Wifi for to build a house printer. One of the motor axis is used for a rotary that sprays concrete. I need to set up the interface where I can turn on the rotary (z-axis) and it stays on while I jog other axis around. This needed for testing and other functions. I've been turning on the rotary by clicking the home z button and changed the homez file to a ridiculous travel amount to keep it on. The problem I'm having is that I need to jog the other axis (x and Y) around while the rotary stays on. Does anyone no any ways I can do this? Also I need to turn off the rotary when needed...

Hey group, I've been using the Duet Wifi to drive a dual x-axis lead screw 3d printer with a fixed bed and moving gantry. It's been working out great. Most people don't like the idea of a lead screw 3d printer because of backlash and speed issues. But I've been using high helix multi-start screw with anti backlash nuts and the machine performs. Attached is a copy of my firmware files. Also I published everything opensource on Thingiverse if anyone wants to try to build one themselves. I do suggest using the expansion board on this build to help with mesh leveling. We usually run an auto-level routine before mesh leveling to get the dual z-axis gantry parallel followed by a mesh leveling routine.

Here's the Config:
; 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 Nov 16 2017 18:16:14 GMT-0600 (Central Standard Time)

M111 S0 ; Debugging off
G21 ; Work in millimetres
G90 ; Send absolute coordinates...
M83 ; ...but relative extruder moves
M555 P1 ; Set firmware compatibility to look like RepRapFirmare

; Motor remapping for dual X
;M584 X0:3 Y1 Z2 U3 E4 P3 ; Driver X0:3, 1 for Y, Z=2 U=3, Extruder 4; General preferences
;Motor remapping with U axis visible
M584 X0:3 Y1 Z2:9 U3 E4 ; Driver X0:3, 1 for Y, Z2:9 , , U=3, Extruder 4; General preferences

; LEADSCREW POSTIONS
M671 X-115:650 Y150:150 S5.0;

;oldfirmwareM911 S10 R11 P"M913 X0 Y0 G91 M83 G1 Z3 E-5 F1000"'
M911 S22 R25.0 P"M913 X0 Y0 G91 M83 G1 Z3 E-5 F1000"
M208 X0 Y0 Z0 U0 V0 S1 ; Set axis minima
M208 X600 Y300 Z235 U600 V210 S0 ; Set axis maxima

; Endstops
M574 X1 Y2 Z2 U1 S1 ; Set active high endstops
M558 P3 I1 H10 F600 T6000 ; Set Z probe type to switch and the dive height + speeds
G31 P500 X15 Y15 Z0.6 ; Set Z probe trigger value, offset and trigger height
M557 X20:480 Y20:300 S40 ; Define mesh grid

; Drives
M569 P0 S1 ; Drive 0 goes X1 forwards
M569 P1 S0 ; Drive 1 goes Y forwards
M569 P2 S0 ; Drive 2 goes Z forwards
M569 P3 S1 ; Drive 3 goes X2 forwards
M569 P4 S0 ; Drive 4 goes E fowards
M569 P5 S1 ;
M569 P6 S0 ;
M569 P7 S1 ;
M569 P8 S1 ;
M569 P9 S0 ; Drive 9 goes Z2 forward

; Configure Drives
M350 X16 Y16 Z16 U16 V16 E16 I1 ; Configure microstepping with interpolation
M92 X64 Y64 Z1259.843 U64 V1259.843 E418.5 ; Set steps per mm
M566 X1200 Y1200 Z12 U1200 V12 E120 ; Set maximum instantaneous speed changes (mm/min)
M203 X7200 Y7200 Z180 U7200 V180 E1200 ; Set maximum speeds (mm/min)
M201 X500 Y500 Z250 U500 V250 E250 ; Set accelerations (mm/s^2)
M906 X2300 Y2300 Z1400 E1200 U2300 V1400 I30 ; Set motor currents (mA) and motor idle factor in per cent
M84 S30 ; Set idle timeout

; Heaters
M140 H-1 ; Disable heated bed
M305 P1 T100000 B4725 C7.060000e-8 R4700 ; Set thermistor + ADC parameters for heater 1
M143 H1 S280 ; Set temperature limit for heater 1 to 280C

; Tools
M563 P0 D0 H1 ; Define tool 0
G10 P0 X0 Y0 U0 V0 Z0 ; Set tool 0 axis offsets
G10 P0 R0 S0 ; Set initial tool 0 active and standby temperatures to 0C

; Network
M550 PWorkhorse ; Set machine name
M552 S1 ; Enable network S1 router s2 hotspot
; Access point is configured manually via M587 by the user
M586 P0 S1 ; Enable HTTP
M586 P1 S0 ; Disable FTP
M586 P2 S0 ; Disable Telnet

; SetNetwork macro to set up access to dummy test Wifi network
;M552 S0;
;G4 S5;
;M589 "network name" P"password" I192.168.1.117;
;G4 S5;
;M552 S2;

; Fans?
M106 P0 S1 I0 F500 H-1 ; Set fan 0 value, PWM signal inversion and frequency. Thermostatic control is turned off
M106 P1 S1 I0 F500 H-1 ; Set fan 1 value, PWM signal inversion and frequency. Thermostatic control is turned off
M106 P2 S1 I0 F500 H-1 ; Set fan 2 value, PWM signal inversion and frequency. Thermostatic control is turned off

; Custom settings are not configured

; Miscellaneous
M501 ; Load saved parameters from non-volatile memory
T0 ; Select first tool

Here's the HomeX:
; homex.g
; called to home the X axis
;
; generated by RepRapFirmware Configuration Tool on Thu Nov 16 2017 18:16:14 GMT-0600 (Central Standard Time)

; Lift Z relative to current position
G91
G1 S2 Z5 F2000
G90

; Move quickly to X axis endstop and stop there (first pass)
M584 X0 U3 ; Split X into 2 (X+U)
G1 S1 X-605 U-605 F1500

; Go back a few mm
G91
G1 S2 X5 U5
G90

; Move slowly to X axis endstop once more (second pass)
G1 S1 X-605 U-605 F360

M584 X0:3 ; Join U to X again

; Go back a few mm
G91
G1 S2 X5 U5
G90

; Lower Z again
G91
G1 S2 Z-5 F2000
G90
;;;;

https://www.thingiverse.com/thing:2764064
https://www.3ddistributed.com/
https://www.youtube.com/watch?v=afbCD0LzNQE&t=100s

link text
0_1539724921203_config.g 0_1539724934829_homeall.g 0_1539724938661_homex.g 0_1539724952377_homey.g 0_1539724957522_homez.g