@breed No need for a heated bed I am printing ceramics

Hello everyone!

I am building a custom delta 3d printer and I could use some help on calculating the rod lengths.

I made a simulation of the geometry in the following link

http://danalspub.com/DKcalc/?he=1000&ve=2000&dr=900&lr=1550

The vertical extrusions will be 2000mm as I already have them.

The horizontal extrusions at 1000mm give me a printable radius of 316mm which I am happy with.

Is the ratio of the horizontal extrusions and rod lengths in the simulation correct or is there is a better solution?

Thanks in advance for any help!

@deckingman What exactly do you mean by (quote) " The problem is that the motor connected to the external driver doesn't behave properly". ?

I mean that when i try to change the microstepping through :
OLD : "M350 X16 Y16 Z16 E16:16 I1"
NEW : "M350 X16 Y16 Z16 E16:2 I1"

or steps per mm through :
OLD : M92 X80.00 Y80.00 Z80.00 E292.24:141.73
NEW : M92 X80.00 Y80.00 Z80.00 E292.24:500

the motor at E1 behaves in the same way that it used to as if the changes didn't take any effect.

Setting E292.24:141.73 or E292.24:500 makes no difference at all at the distance the motor travels for a movement of 100mm

Here is my config.g V2.02 firmware

; Configuration file for factory testing Duet Ethernet and Wifi with V2.02 firmware

*******************************************************************************************************************
FOR TESTING ONLY! USE https://configurator.reprapfirmware.org/ to generate configuration files for your printer!
*******************************************************************************************************************


; Communication and general
M111 S0                            		; Debug off
M550 PDuetTest					; Machine name and Netbios name (can be anything you like)
M551 Preprap                   			; Machine password (used for FTP)

*** Ethernet networking: The following lines are used for factory testing - PLEASE REMOVE THEM
M540 P0xBE:0xEF:0xDE:0xAD:0xFE:0xED		; MAC Address
M552 P192.168.1.101				; IP address
M554 P192.168.1.255				; Gateway
M553 P255.255.255.0				; Netmask

;*** End of factory test lines to be removed

M555 P2						; Set output to look like Marlin
G21						; Work in millimetres
G90						; Send absolute coordinates...
M83						; ...but relative extruder moves

; Delta Settings
M665 L440.000 R227.453 H455.2 B185.0 ; Delta base

; Network
M550 P"Anycubic Predator"                     				; Set machine name
M551 P""                         							; Set password
M552 S1  	                        				; Enable network and acquire dynamic address via DHCP
M586 P0 S1                                  				; Enable HTTP
M586 P1 S0                                  				; Disable FTP
M586 P2 S0                                  				; Disable Telnet

; Drives
M584 E3:10
M569 P0 S0                                  				; Drive 0 goes forwards
M569 P1 S0                                  				; Drive 1 goes forwards
M569 P2 S0                                  				; Drive 2 goes forwards
M569 P3 S1                                  				; Drive 3 goes forwards
M569 P4 S1                                  				; Drive 4 goes forwards
M569 P10 S1                                  				; Drive 10 goes forwards
M350 X16 Y16 Z16 E16:16 I1                     				; Configure microstepping with interpolation

;M92 X80.00 Y80.00 Z80.00 E520:252.2             			; Set steps per mm

M92 X80.00 Y80.00 Z80.00 E292.24:141.73             			; Set steps per mm

M566 X3000 Y3000 Z3000 E1000:1000    	            			; Set maximum instantaneous speed changes (mm/min)
M203 X5000.00 Y5000.00 Z5000.00 E10000:10000 					; Set maximum speeds (mm/min)
M201 X1000.00 Y1000.00 Z1000.00 E3000:3000   				; Set accelerations (mm/s^2)
M906 X1650.00 Y1650.00 Z1650.00 E800:3000 I30 				; Set motor currents (mA) and motor idle factor in per cent

M84 S30                                     				; Set idle timeout

; Retraction
;M207 S4.0 F5000 R-0.025 T2500 Z0.5							; Firmware retraction

; Axis Limits
M208 Z0 S1                                  				; Set minimum Z

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

; Z-Probe
M558 P4 H5 F600 T9000                       				; Set Z probe type to switch and the dive height + speeds
;G31 P500 X0 Y0 Z16.0  
G31 P500 X0 Y0 Z17.04                 					; Set Z probe trigger value, offset and trigger height
M557 R115 S20                               				; Define mesh grid
G29 S1									; Load the heightmap

; Heaters
;M307 H0 A137.8 C533.3 D1.5 V24.3 B0                       		; Disable bang-bang mode for the bed heater and set PWM limit
;M305 P0 T100000 B4300 C0 R4700                 				; Set thermistor + ADC parameters for heater 0
;M143 H0 S120                                				; Set temperature limit for heater 0 to 120C
;M305 P1 T100000 B4300 C0 R4700                 				; Set thermistor + ADC parameters for heater 1
;M143 H1 S240                                				; Set temperature limit for heater 1 to 240C

; 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
M572 D0 S0.1												; Pressure Advance
;M591 D0 P2 C4 S1											; Activate filament sensor
M404 N1.75 													; Set for print monitor
M592 D0 A0.07772 B-0.00029 									; Nonlinear extrusion. Set parameters for extruder drive 0

;Set Mixing Extruder
M302 ; Allow cold extrusion
M563 P0 D0:1 ; Define tool 3 (P3) to use all three extruders (D0:1:2) 
M568 P0 S1 ; Enable mixing for tool 3
M567 P0 E0.9:0.1 ; Set mixing ratio for tool 3.
M913 E100:300 ; Set current of ram 


;*** Networking
M552 S1						; Turn network on


; Miscellaneous
M501                                               			; Load saved parameters from non-volatile memory

Hello everybody!

I spent most of my day today trying to configure Duet 2 wifi for a mixing extruder setup. I want to use one internal driver for E0 and one external driver through the CONN_LCD pins for E1.

I followed the documentation for the drive mapping etc and I managed to get both of the motors moving.

The problem is that the motor connected to the external driver doesn't behave properly.

After trying every combination in the config I could imagine and reading any post I could find on the forums I read that it is not possible to combine internal and external drivers on the same axis. Is this true?

If thats the case I guess I should drive both extruder motors through the CONN_LCD (drivers 9 and 10)