Extruder won't extude at specific coordinates

TimsWorkshop

Very, very strange issue here...

I've got an extruder motor, which at specific coordinates, it will not extrude and I get reported motor out of phase errors. I did put a new extuder motor on, it's a Stepping Motor 42BYGH-40 1.8 - 23A

As example:

Nozzle at X227 Y187.5 Z55 (center of bed) - I can extrude no problem
Nozzle at X27 Y0 Z55 (top left of bed) - I can extrude no problem
Nozzle at X327 Y0 Z55 (top right of bed) - I can extrude no problem
Nozzle at X327 Y355 Z55 (back right of bed) - I can extrude no problem
Nozzle at X317 Y355 Z55 (back right of bed) - I can extrude no problem
Nozzle at X317 Y355 Z55 (back right of bed) - I can extrude no problem
Nozzle at X215 Y355 Z55 (back right of bed) - I cannot extrude no problem - Console reports Warning: motor phase A may be disconnected reported by driver(s) 3
Nozzle at X225 Y355 Z55 (back right of bed) - I cannot extrude no problem - Console reports Warning: motor phase A may be disconnected reported by driver(s) 3

I'm at a loss as to why at a specific point, my extruder motor stops working - and the cable are not strained, they're at the back of my printer closest to the board... in fact, when it moves further way, it starts to work.

fcwilt

@infidelprops said in Extruder won't extude at specific coordinates:

I've tried to make it a bit easier to read and eliminated some duplicates

Z position = 55

XY positions that extrude
-------------------------
X227 Y187.5 ; center
X27  Y0     ; top  left
X327 Y0     ; top  right
X327 Y355   ; back right
X317 Y355   ; back right

XY positions that don't extrude
-------------------------------
X215 Y355 ; back right
X225 Y355 ; back right

fcwilt

@infidelprops

My first thought would be intermittent wiring.

Frederick

alankilian

@infidelprops

Try this experiment:

Disable your X and Y motors by unplugging them from the Duet
Remove filament
Enable cold extrusion
Start a long extrusion
By hand, move your carriage around

If you get the error when you move your carriage by hand to those locations, it's 100% a wiring issue.

If you CAN move around and the extrusion continues, I'll propose another experiment.

TimsWorkshop

@alankilian and @fcwilt Thanks, I'll give that a go, but I expect it's a wiring issue as I plugged in a different stepper motor and it is doing the same thing.

On that note... does anyone know the specific name these stepper motor JSTs are? I've been trying to find them at my local stores website, but just not sure which ones they are.

TimsWorkshop

@infidelprops found them... looks to be 2.0 mm pitch, 6 pin JSTs

TimsWorkshop

@alankilian Ok... really good experiment... X/Y unplugged and did a hot extrusion as I needed to get some filament out, but as I manually moved the carriage around, the extruder did not skip a beat and it kept moving...

o_lampe

@infidelprops Is your extruder cable bundled with the X- or Y-stepper cables?
I had issues of that kind, because I had a stepper cable wrapped around another stepper cable. It was only one turn.

TimsWorkshop

@o_lampe Thanks for the suggestion mate, but they are seperated and I don't have them anywhere near each other, except for when plugged into the board.

alankilian

@infidelprops OK, great experiment. So it doesn't seem like it's a wiring issue so far.

Next experiment.........

Start near the middle of the bed and extrude.
Then use G1 X... Y... to (at a low-speed) move in small steps towards the location where you get the extrusion motor error.
See how close you get before getting the error.

Go back and forth to see if it always happens at the same location.
Try moving slowly or quickly to see if that makes any difference.

I'm trying to see if there's some electrical interference from the X-Y motors or what.