Greetings,

I am totally new to Duet, trying to get my first build up and running. I am using the 6XD and 1XD drives to run closed loop steppers. I have 4 Z, 2 Y, and 1 X Stepper.

CL57T-V41 from Steppers online.

I am struggling to understand the alarm message wiring:

Its the "Com" port that is throwing me off. Is it as simple as wiring +5V to "Com", and then the "ALM" to the "D0_ERR" pin?

Is three any further setup that has to be done to monitor these pins?

Also curious of the printer behavior, when an error hits, what will the machine do? Is it possible clear the drive problem and continue printing?

Would really appreciate any help!

Scott

@droftarts

Thanks Ian! I will give it a try! Is the general idea to get rid of the z switches, as this is now done with the touch probe?

Scott

Greetings,

I just read through the documentation on choosing a Z-probe, but am struggling to decide which one to purchase. Wondering if I could get some help.

My Setup:

1. Glass print bed
2. 4 Z Axis lead screws
3. Liquid cooled hotend from slice:
   https://www.bondtech.se/product/mosquito-magnum-plus-liquid-cooled-285mm-hotend/

I have a very large gantry, 1,300mm print bed and certainly think a probe will be necessary. It looks like most fit directly onto the hot end. I dont understand the mounting particularly well, wondering if it would work with this liquid cooled head? Would anyone be able to give me a suggestion for a probe for this?

A second question about axis homing switches. Would I be able to forgo them on the Z axis altogether as long as I have a decent touch probe?

Thanks!

Scott

@fcwilt I am planning on a large tempered glass surface.

@fcwilt Makes sense. In the case of an error where the part is stopped mid print, you have to remove the part. I suppose this is inevitable if you want to re-zero the bed.

Questions:
Endstop positions - should be slightly above the bed?
Z Probe - Do you have any suggestions for a machine like this?

I

@fcwilt
Ha! Well.. looks like I could use some advice here. Please have a look at the pictures for perspective. This is my first experience with Duet and I'm learning.

1800mm cubic volume, the gantry moves with the light weight print head. The glass plate is fixed at the bottom. You can see the 4 stepper motors in each corner, there is a lead screw which raises and lowers each side. I was imagining a homing program where they all move up in z until they hit the switches. If there is a better way to do this I am WIDE open to suggestions?? Struggling to think of how to get each corner level.

I am using ClearPath servos for the X and Y Axis.
https://teknic.com/model-info/CPM-SDHP-2310S-ELN/?model_voltage=75VDC

They have a nice feature where they move at a reduced torque into a hard stop. I was thinking of bumping the X/Y into stops and setting the position at -900mm for both X and Y. Is there a better way of doing this?

Thanks for your advice!

-Snyggis

@fcwilt

Ok, looking at this it is a bit more complicated.

X and Y - I am using servo motors. They have a "Home to hard stop" feature. This is done by driving an IO high on the servo drive and once it has completed homing the servo drive will output a signal to indicate homing complete.

I believe this is what I am trying to accomplish:

1. Drive all 4 Z stepper motors up to their top end stops. This gets the head out of the way for homing X and Y.
2. Home X and Y

• Activate IO to commence homing

• Wait for an IO to go high to confirm homing complete

So far does this sound reasonable? It is a large gantry and I want the z as square as possible. Would it make sense to then go down with a z probe and find the position of the table and measure its flatness?

@droftarts Awesome! Thanks for the help.

A few more questions. It looks like the web tool automatically made me a few homing programs:

; generated by RepRapFirmware Configuration Tool v3.3.16 on Fri Nov 17 2023 14:07:11 GMT-0500 (Eastern Standard Time)

G91 ; relative positioning
G1 H2 Z5 F6000 ; lift Z relative to current position
G1 H1 Z1105 F1800 ; move Z up until the endstop is triggered
G92 Z1100 ; set Z position to axis maximum (you may want to adjust this)

Running this code should drive all of the Z axis into their homing switches?

Greetings,

I am making a large printer (1800mm^3), my first duet setup and would like some feedback if I am getting my axis setup properly.

I have 4 Z lead screws, and 2 Y rack and pinions:

Does this syntax look right for defining the drives for my 8 Axises?? The docs on how to map the drives were a bit confusing, so I am hoping I got this right.

; Drives on Duet3 6XD board
M569 P0.0 S1 ; X physical drive 0.0 goes forwards
M569 P0.1 S1 ; Y1 physical drive 0.1 goes forwards
M569 P0.2 S0 ; Y2 physical drive 0.2 goes Reverse
M569 P0.3 S1 ; Z1 physical drive 0.3 goes forwards
M569 P0.4 S1 ; Extruder physical drive .4 goes forwards

; Drives on Duet3 3HC board
M569 P1.0 S1 ; Z2 physical drive 1.0 goes forwards
M569 P1.1 S1 ; Z3 physical drive 1.0 goes forwards
M569 P1.3 S1 ; Z4 physical drive 1.0 goes forwards

; Configure axises
M584 X0.0 Y0.1:0.2 Z0.3:1.0:1.2:1.3 E0.2 ; set drive mapping

The next question is in regard to endstops. Again, does this syntax look reasonable?

; Endstops
M574 X1 S1 P"io0.in" ; X Endstop on 6XD board
M574 Y1 S1 P"io1.in" ; Y Endstop on 6XD board
M574 Y2 S1 P"io2.in" ; Y Second Axis Endstop on 6XD board

M574 Z1 S1 P"1.io0.in" ; Z Axis Endstop on 6XD board
M574 Z2 S1 P"1.io1.in" ; Z Second Axis Endstop on 6XD board
M574 Z3 S1 P"1.io2.in" ; Z Third Axis Endstop on 6XD board
M574 Z4 S1 P"1.io3.in" ; Z Fourth Axis Endstop on 6XD board

Really appreciate the help!

Scott

@droftarts

Thank you for the great advice.. I have been reading through the documentation much more and am getting a better handle on things.

Is there a reason why I wouldn't just use the 6XD for the 4 Z motors, and use the two extras for the two extruder steppers? I did purchase the servos already - they are ClearPath all in one motors. Seems like I would need three 1XD boards to run these. Do you know if I can use the fault output on the servo to stop the machine through the 1XD board?

Can you help me understand the benefits of using boards close to the motors? Each board needs CAN distributed to it. This is CAT5 cable, right? Also whatever power the motor needs. Is that typically easier than distributing the cable for motor power or potentially encoders?

My bed heater is also going to be very big, probably running off 220V. Would it make sense to use one of the thermistor inputs on the 6XD, set it up to run PID control, and use the DC control output to drive an AC solid state relay?

Scott