so if I wanted to buy an industrial duet 3 printer any suggestions?

@o_lampe There are 2 motors on each z axis and 1 motor on each Y axis I actually got this to work as fine as homing and moving correctly. I found a way to home both Z axis by adding the commands to the homez.g. What it does is first map the first Z axis with the first 2 motors then it remaps the 2nd Z axis with the other 2 motors and after it's done it combines all the motors into one Z axis motor.

It would be my goal to have both tools to extrude simultaneously on the same part so that basically it would cut the print time in 1/2. The chassis that I need to build for autonomous vehicle is divided into 3 parts and 2 of these parts took about 4 days to print -this was on a printer I bought but was very disappointed with it. I then decided to build my own.

@nurgelrot to test it I cut the filament, activate and heat up the hot end, and then extrude till all filament runs out. which should pop up the message. I am using RRF3.3RC2.

@fcwilt Yes, both X axis can travel the full length of the Y axis bed. Currently I am focusing on getting one tower at a time to generate a relative good print, then I will try to get the other tower to do the same with different filament.

@fcwilt There can only be one independent Z axis at a time, that's why I switch the motor config to go to one or another. Would be sweet if two independent Z and X axis could work at the same time on the same print, thus cutting the print time in 1/2.

@fcwilt The macro switches between the two or joins them back:
Left Tower:

;

; switchLeftTower.g
; called to home the Z axis
;
G91
;M18 X Z                                ; disable Z motors before reassigning them                                 
;M350 X16 Z16 I1                        ; Z reassign microstepping
;M906 X800 Z800 I30                     ; Z reassing currents (mA) and motor idle factor in per cent
;T0 P0                                  ; Select Tool 1 and run tfree0 only to park T0

;home X first
;G1 H2 Z1 F6000     ; lift Z relative to current position
;G1 H1 X-685 F1100  ; move quickly to X axis endstop and stop there (first pass)
;G1 H2 X10 F6000    ; go back a few mm
;G1 H1 X-685 F360   ; move slowly to X axis endstop once more (second pass)
;G1 H2 X10 F6000  

;G1 H2 Z1 F6000    ; lift Z relative to current position
;G1 H1 Y-705 F1100 ; move quickly to Y axis endstop and stop there (first pass)
;G1 H2 Y5 F6000    ; go back a few mm
;G1 H1 Y-705 F360  ; move slowly to Y axis endstop once more (second pass)
;G1 H2 Y5 F6000    ; go back a few mm

M584 Z0.1:0.4                   ; Split the 2 Z towers for independent control. this will move right tower only

G1 H1 X0 Y250 Z1 F6000          ; lift Z relative to current position
G30 K0                          ; this will home and probe the left Z tower

G90

Right Tower
;
; switchToRightTower.g
; called to home the Z axis
;
G91
;M18 X Z                              ; disable Z motors before reassigning them
;M350 X16 Z16 I1                      ; Z reassign microstepping
;M906 X800 Z800 I30                   ; Z reassing currents (mA) and motor idle factor in per cent
;T0 P0                                ; Select Tool 1 and run tfree0 only to park T0

;home X first
;G1 H2 Z1 F6000     ; lift Z relative to current position
;G1 H1 U-685 F1100  ; move quickly to X axis endstop and stop there (first pass)
;G1 H2 U10 F6000    ; go back a few mm
;G1 H1 U-685 F360   ; move slowly to X axis endstop once more (second pass)
;G1 H2 U10 F6000  

;G1 H2 Z1 F6000    ; lift Z relative to current position
;G1 H1 Y-705 F1100 ; move quickly to Y axis endstop and stop there (first pass)
;G1 H2 Y5 F6000    ; go back a few mm
;G1 H1 Y-705 F360  ; move slowly to Y axis endstop once more (second pass)
;G1 H2 Y5 F6000    ; go back a few mm

M584 Z0.0:0.5                   ; Split the 2 Z towers for independent control. this will move right tower only

G1 H1 U0 Y250 Z1 F6000          ; lift Z relative to current position
G30 K1                          ; this will home and probe the left Z tower

G90

@phaedrux Yes

@dc42 OK, wait a minute, where is the GCode viewer? Is this a plug in to the web interface? Definitely something to download and install. does the GCode viewer provide the GCode that is currently being executed in real time? This could save a lot of bad prints.

@phaedrux OK, thankyou, I have not done an extruder calibration test, just used recommended flow rates and such...

@th0mpy It works for a good while before starting to do this, originally I had the filament runout sensor put inline with the filament right before the extruder, which caused pressure on the filament and also the way I had the filament run to that point at times it was pretty tight between the extruder and the filament roll. Fixed that issue which improved the print tremendously, The clicking noise persists. this is the E3D Titan Aqua which keeps it really cool, this is a water cooled system. I pause the print and do a extrude test and it extrudes just fine, no clogging. The only thing that I do not have set up yet are the blower fans to cool off the extruded filament. But I need to print a mount for it first.

Progressing on with the build and now when extruding I am hearing a clicking noise. I see the larger gear advancing one notch but then it doesn't advance to the next notch, it just sits there clicking. Not sure what could be causing this. This doesn't happen right away into the print, this happens at 4 or more hours into the print it corrects itself and continues and eventually it happens again. I tried to alleviate all the pressures from pulling the filament so that the extruder drive makes less effort in pulling the filament. This seemed to have helped, but not 100%. The other option is the small metal knob that makes the gears tighter against the filament. I will try loosening this I already reduced the amps to 800mA. Does anyone have any suggestions? thanks.

How is this best done? With G-code o C/C++ ? I mean in reality I can see that this would benefit all. I would like a way to pause a print and click on a map of the print, and have it restart from that point clicked on the map.

@jsinicro No errors at DWC.

@phaedrux OK, that actually makes sense. I will check when I get home, but for the extruder motor its a NEMA 17 I think I have it set at 800mA or 1.2A..

@jsinicro wiggle works too.

@o_lampe I meant to say jiggle.