double extruder motor - g.code?

dutti · 6 Oct 2020, 12:02

hey,
I want to have 2 motors on each filament.
One motor for the direct drive extruder, one motor for changing the filament and helping getting filament from a heavy filament roll (10kg).
Does anybody knows what I have to change on the g code?
Driver 1 + Driver 0 or
Driver 2 + Driver 0 Must work together all the time. Same steps etc.
Drivers areon the expansion board.
Duet3

thanks
R.G.


; Configuration file for Duet 3 (firmware version 3)
; executed by the firmware on start-up
;
; generated by RepRapFirmware Configuration Tool v3.1.3 on Tue Jun 23 2020 22:36:44 GMT+0200 (Mitteleuropäische Sommerzeit)

; General preferences
G90 ; send absolute coordinates...
M83 ; ...but relative extruder moves
M550 P"Duet 3" ; set printer name

; Drives
M569 P0.0 S1 ; physical drive 0.0 goes forwards
M569 P0.1 S1 ; physical drive 0.1 goes forwards
M569 P0.2 S1 ; physical drive 0.2 goes forwards
M569 P0.3 S1 ; physical drive 0.3 goes forwards
M569 P0.4 S1 ; physical drive 0.4 goes forwards
M569 P0.5 S1 ; physical drive 0.5 goes forwards
M569 P1.0 S1 ; physical drive 1.0 goes forwards
M569 P1.1 S1 ; physical drive 1.1 goes forwards
M569 P1.2 S1 ; physical drive 1.2 goes forwards
M584 X0.0 Y0.1 Z0.2:0.3:0.4:0.5 E1.0:1.1:1.2 ; set drive mapping
M350 X16 Y16 Z16 E16:16:16 I1 ; configure microstepping with interpolation
M92 X160.00 Y160.00 Z1600.00 E375:375:375 ; set steps per mm ; set steps per mm
M566 X900.00 Y900.00 Z12.00 E120.00:120.00:120.00 ; set maximum instantaneous speed changes (mm/min)
M203 X6000.00 Y6000.00 Z180.00 E1200.00:1200.00:1200.00 ; set maximum speeds (mm/min)
M201 X500.00 Y500.00 Z40.00 E250.00:250.00:250.00 ; set accelerations (mm/s^2)
M906 X1400 Y1400 Z3000 E1000:1000:1000 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 X700 Y700 Z800 S0 ; set axis maxima

; Endstops
M574 X2 S1 P"!io3.in" ; configure active-high endstop for high end on X via pin !io3.in
M574 Y2 S1 P"!io0.in" ; configure active-high endstop for high end on Y via pin !io0.in

; Z-Probe
M558 P9 C"io4.in" H10 F200 T1800 ; set Z probe type to bltouch and the dive height + speeds
M950 S0 C"io4.out" ; create servo pin 0 for BLTouch
G31 P25 X0 Y-36 Z2.5 ; set Z probe trigger value, offset and trigger height
M557 X10:600 Y10:600 S200 ; define mesh grid

; Heaters
M308 S0 P"temp0" Y"thermistor" T100000 B4138 ; 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 H1 S1.00 ; disable bang-bang mode for the bed heater and set PWM limit
M140 H0 ; map heated bed to heater 0
M143 H0 S90 ; set temperature limit for heater 0 to 90C
M308 S1 P"temp1" Y"thermistor" T100000 B4138                                     ; configure sensor 1 as thermistor 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

; Fans
M950 F0 C"out8" Q500 ; create fan 0 on pin out3 and set its frequency
M106 P0 S1 H-1  ; set fan 0 value. Thermostatic control is turned off
M950 F1 C"out7" Q500 ; create fan 1 on pin out7 and set its frequency
M106 P1 S1 H-1 ; set fan 1 value. Thermostatic control is turned off
M950 F2 C"out8" Q500 ; create fan 2 on pin out8 and set its frequency
M106 P2 S1 H 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
M671 X185:185:615:615 Y-125:925:925:-125 S2.5

; Miscellaneous
M501 ; load saved parameters from non-volatile memory
M911 S10 R11 P"M913 X0 Y0 G91 M83 G1 Z3 E-5 F1000" ; set voltage thresholds and actions to run on power

deckingman · 6 Oct 2020, 13:25

@barbarossa-cologne

To run 2 extruder motors in "push-pull" configuration you simply map both motors to the tool and set the mixing ratio to 1:1.

Assuming you have 3 extruder motors mapped as you have them in your M584. Then the first motor is extruder drive 0, the second is extruder drive 1 and the third is extruder drive 2. Assuming the first one is common (driver 0) then you define the tool like this....

M563 P0 D0:1 H1 F0 ; define tool 0
and set the mixing ratio like this
M567 P0 E1.00:1.00

To change extruder drives, you now have 2 options and to switch between them, the best way might be to use macros. The first option is simply to change the drive mapping. So it becomes
M563 P0 D0:2 H1 F0 ; define tool 0

Or you can create a second tool as above but change P0 to P1 so the second tool becomes tool 1 and when you change to a different spool, you change the tool.

Actually, there is also a third option and that is to have a single tool but map all drives to it like this:

M563 P0 D0:1:2 H1 F0

and then change the mixing ratio so for one reel of filament you would use:
M567 P0 E1.00:1.00:0.00

and for the second reel of filament you would use
M567 P0 E1.00:0.00:1.00

HTH

dutti · 7 Oct 2020, 12:51

@deckingman said in double extruder motor - g.code?:

M563 P0 D0:2 H1 F0 ; define tool 0

I would prefer the option with
:M563 P0 D0:2 H1 F0 ; define tool 0

with adding the second tool it´s :

M563 P0 D0:2 H1 F0 ; define tool 0
M563 P1 D0:2 H1 F0 ; define tool 1

Is this correct?
thanks for the great expalantion!!
Richard

deckingman · 7 Oct 2020, 16:09

@barbarossa-cologne said in double extruder motor - g.code?:

@deckingman said in double extruder motor - g.code?:

M563 P0 D0:2 H1 F0 ; define tool 0

I would prefer the option with
:M563 P0 D0:2 H1 F0 ; define tool 0

with adding the second tool it´s :

M563 P0 D0:2 H1 F0 ; define tool 0
M563 P1 D0:2 H1 F0 ; define tool 1

Is this correct?
thanks for the great expalantion!!
Richard

Err no. Your two tool definitions are identical so that won't work. With reference to your sketch, you have extruder drive 0 as "common", and driver 1 is the left hand filament and driver 2 is the right hand filament. So your two tool definitions should be:

M563 P0 D0:1 H1 F0 ; define tool 0
M563 P1 D0:2 H1 F0 ; define tool 1

That is to say, one tool uses extruder 0 and extruder 1, the other tool uses extruder 0 and extruder 2.

dutti · 8 Oct 2020, 17:47

ok....
I´ll try and tell you if it works!
thank you for the great answer.
LG
Richard

dutti · 9 Oct 2020, 11:21

This post is deleted!

dutti · 9 Oct 2020, 11:22

This post is deleted!

dutti · 9 Oct 2020, 12:40

@deckingman
It´s working..
Thanks a lot!!

deckingman · 9 Oct 2020, 13:38

@barbarossa-cologne said in double extruder motor - g.code?:

@deckingman
It´s working..
Thanks a lot!!

XSIVSPD · 1 Jun 2021, 01:13

@deckingman thanks for all your knowledge and helpfulness on this forum!

I'm thinking of making a MMU2 type multi-material setup that's run via the duet and a duex5 so this thread has been super helpful!

I have a BMG that is currently set up as direct drive, and i would like to keep it where it is so that i have the excellent extrusion control that it gives me.

My question is: do both drives need to be set to the same steps/mm ?

the BMG is 3:1 and the mmu plans that I'm looking at are directly driven by hobs off the stepper shaft. can i set that up with m92 since (im assuming) I'll need to define the additional stepper as U or V axis

Thanks in advance!