Need help with Ender-6 core xy motor movement

davidewen

Again, that would give me the same results, but with added effort of changing code.

I've done a little more testing. This time by phyiscal force.
I manually moved the X / Y axis and watched the motor directions.

X - both motors move in the same direction
Y - motors move opposite of each other

So, somehow I need to figure out how to make Duet do the same.

peter247

@davidewen Yes , mine is in the same direction on both motors .
But you still may need to swap motors .

Phaedrux

Check out these two posts they might help you get things straightened out.

https://forum.duet3d.com/topic/14971/vcore-pro-core-xy-the-x-and-y-axis-home-issue/4

https://forum.duet3d.com/topic/12676/mirrored-x-axis/9

The gist of it is to choose where the front of your printer is when looking at it straight on. 0,0 is the front left corner. X+ moves to the right, X- moved to the left, Y+ moves to the back, Y- moves to the front. That is the way it should be. If it's not like that yet, don't worry, we will make it that way. this is to match the slicer and CAD coordinate systems.

Then your endstop location is fixed either at the low end or high end of travel. That determines your M574 commands.

Then your homing directions will be positive or negative o move the head towards the endstops.

Now with all that fixed you can do the motor direction test in the corexy setup guide to determine what to do next.

davidewen

@phaedrux
Thank you for your help.
Sorry for my delayed response. I was on vacation last week.

Ender 6 physical setup
X & Y motors @ rear
X & Y stops @ max

NOTE: I had to swap X & Y at the Duet board to get the correct movement.

I have the X & Y axis moving correctly per your referenced link
https://duet3d.dozuki.com/Wiki/ConfiguringRepRapFirmwareCoreXYPrinter

X homes correctly.
Y homes correctly.

Thanks again!

David

Phaedrux

Just to double check, try printing some text to see if anything is mirrored.

davidewen

@phaedrux
I'm not to the point of printing yet. I don't even know how to load a file yet.

I'm still trying to figure out the rest of the config.

I'm currently working on the Extruder.
I installed a Bondtech extruder. So far it's working, but not loading filament all the way, so I must have some parameters incorrectly set.

So far I have the X, Y & Z axis moving in the correct directions and the endstops working.

The EZAble seems to be around 15mm off to the + side even though I have it set to +2mm.

davidewen

@phaedrux

First print completed.
I printed text to confirm no mirroring was happening.

I had 2 problems.
1: 1st layer was crushed against the build plate. I had to babystep by 2.8 mm to get filament to come out. Homing Z works everytime. I used Cura to slice.

2: print was horribly slow. It took 38m 27s to print "Duet 3 mini 5+" @ 0.6mm thickness.

I'm using mesh compensation, and it maps out the surface.

Printer is capable of moving 200mm/s.

Any suggestions for solving these 2 problems?

Phaedrux

@davidewen said in Need help with Ender-6 core xy motor movement:

1: 1st layer was crushed against the build plate. I had to babystep by 2.8 mm to get filament to come out. Homing Z works everytime.

Calibrate your probe offsets.

https://duet3d.dozuki.com/Wiki/Test_and_calibrate_the_Z_probe#Section_Calibrate_the_Z_probe_trigger_height

@davidewen said in Need help with Ender-6 core xy motor movement:

2: print was horribly slow.

Check your cura start gcode section for any speed commands that may be there overriding your config.g settings. Also make sure you're set to use RepRap Gcode flavour.

Post a sliced gcode file here if you're unsure.

davidewen

@phaedrux

Thanks. I'll calibrate the probe offsets.

I'm not sure about the RepRap flavor.
Here's the gcode that I ran.
Duet 3 mini 5.gcode

Phaedrux

;FLAVOR:RepRap
;TIME:388
;Filament used: 0.145903m
;Layer height: 0.2
;MINX:67.247
;MINY:108.91
;MINZ:0.2
;MAXX:182.753
;MAXY:141.085
;MAXZ:0.8
;Generated with Cura_SteamEngine 4.10.0
T0
M190 S50
M104 S200
M109 S200
M82 ;absolute extrusion mode
M201 X500.00 Y500.00 Z100.00 E5000.00 ;Setup machine max acceleration
M203 X500.00 Y500.00 Z10.00 E50.00 ;Setup machine max feedrate
M204 P500.00 R1000.00 T500.00 ;Setup Print/Retract/Travel acceleration
M205 X8.00 Y8.00 Z0.40 E5.00 ;Setup Jerk
M220 S100 ;Reset Feedrate
M221 S100 ;Reset Flowrate

You're ok for reprap flavor.

And as expected, these lines are causing the speeds to be slow.

M201 X500.00 Y500.00 Z100.00 E5000.00 ;Setup machine max acceleration
M203 X500.00 Y500.00 Z10.00 E50.00 ;Setup machine max feedrate
M204 P500.00 R1000.00 T500.00 ;Setup Print/Retract/Travel acceleration
M205 X8.00 Y8.00 Z0.40 E5.00 ;Setup Jerk

Delete them from your start gcode.

davidewen

@phaedrux

I removed the starting gcode info and the print was much faster.
Thanks for that!

Regarding the probe calibration.
I had run that previously.
But, I ran it again anyway.
Even after running it again, I had to babystep +0.6mm to get filament to flow.

Is there someway to make the baby steps permanent?
I have to adjust for every print.

Phaedrux

@davidewen said in Need help with Ender-6 core xy motor movement:

Is there someway to make the baby steps permanent?

If you constantly need to baby step up 0.6mm then you can simply modify your G31 Z value to take that into account. That's how you make it permanent.

It could also be that you are homing Z at a different location than where you are measuring the offset. Ideally they should be the same location at the center of the bed.

davidewen

@phaedrux

I have the config.g file G31 Z value set, but I still have to adjust each print.

I'm still printing the test "DUET" text. Same gcode, just rerunning it.

Duet.gcode

Phaedrux

@davidewen said in Need help with Ender-6 core xy motor movement:

I have the config.g file G31 Z value set, but I still have to adjust each print.

I understand, but if you're consistently needing to babystep, then you can modify your measured G31 Z with that baby stepping amount to make it permanent. Consider it a fine tuning of your G31 Z offset.

If you have G31 Z2 and you have to add +0.6mm to get a good first layer because your nozzle is too close after homing with the probe you can take 2mm - 0.6mm = 1.4mm and change to G31 Z1.4

davidewen

@phaedrux

That seems to have done the trick.
Thanks again.

One more thing I'm having trouble finding info on.
When the print is done, the X/Y carriage moves.
In my case towards the front of the printer.
I would like to move it towards the back of the printer.

Phaedrux

That would all be controlled by your slicer end gcode.