Dual Z Motors on Bigbox - Sanity Check
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M569 commands apply to individual motor drivers. If there is no M569 command for a driver, it defaults to forward motion and standard timing. So I guess the way you have wired the motor, forward motion is correct.
Your M906 command should come after the M584 command, then the Z current parameter will be applied to both Z motors. Your M201/203/566 etc. commands need to take account of the U axis you created, but not additional Z motors.
HTH David
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Thanks! So far all working great. Quieter Z movements too as an unexpected side effect. Happy customer
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Thanks! So far all working great. Quieter Z movements too as an unexpected side effect. Happy customer
I'm glad you're happy. You might care to share your experience on the E3D BigBox forum, because I don't think I've read of anyone else driving the two Z motors in a BigBox independently.
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Well, I've had that for some months now
Thanks to your help David 
But with the help of two extra endstops at Z max.Andyvirus, what fw are you on? I just upgraded to 1.19.2 today and have not looked at the new multi Z leveling yet.
You can read abut my setup with 1.18.1 and two endstops here: https://forum.e3d-online.com/index.php?threads/bigbox-dual-optical-z-max-endstops.2675/
I also hope to test dual Z leveling soon with the IR probe.
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Hi DC42, will do! Just upgraded to a MGN12 Rail for IDEX so will bring it up there too.
I have just found an odd issue with G32 though that you might be able to help with:In my bed.g i have:
[c]G30 P0 X20 Y100 Z-99999 ; probe near a leadscrew was x32
G30 P1 X270 Y100 Z-99999 S2 ; probe near a leadscrew and calibrate 2 motors[/c]and in config.g: [c]G31 X-33 Y-5 Z0.58 ; Set Z probe trigger value, offset and trigger height (IR Probe)[/c]
It seems that on the first probe it takes into account the z prob offset i set in G31 (Z-33) - Great
On the second probe it tries to move to 33mm more to the right than is possible. For now i have set the second probe (right) to 237 to compensate.Maybe I am using G31 wrong but seems to work perfectly in G29 (respects limits minima and maxima).
I have an IR sensor on X carriage which is 33mm to the left of the nozel (now, was at rear 60mm Y).Hi Strips, I am on 1.19.2. I will take a look at what you have done!
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You should only put G30 XY coordinates in bed.g that the probe (not the nozzle) can reach.
With an X offset of -33 in the G31 command, the head will be moved to the X offset you want to probe minus the -33mm; in other words to the X you asked to probe plus 33mm. So when you asked it to probe at X=270mm, it tried to move the head to X=303mm.
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You should only put G30 XY coordinates in bed.g that the probe (not the nozzle) can reach.
With an X offset of -33 in the G31 command, the head will be moved to the X offset you want to probe minus the -33mm; in other words to the X you asked to probe plus 33mm. So when you asked it to probe at X=270mm, it tried to move the head to X=303mm.
Ok makes sense. Probe not Nozzle. Got it. Thats what i was mistaking. Thanks!
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Thanks! So far all working great. Quieter Z movements too as an unexpected side effect. Happy customer
I'm glad you're happy. You might care to share your experience on the E3D BigBox forum, because I don't think I've read of anyone else driving the two Z motors in a BigBox independently.
Done. Quoted you post on the E3D BigBox forum anouncing the leveling fearture using 2 or more motors.
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How well does the true leveling work? I have a bed with 3x linear MGN12 rails in a triangle driven by 3x 1204 ballscrews. I’m afraid of movement when it’s powered down and then binding before it gets to auto level. Is this a true problem or should I just give it a go? Need a deux5 card to make it happen so don’t want to dive in just to fail ^^
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You can configure a maximum amount of individual leadscrew adjustment to apply in the M671 S parameter, to avoid binding. No adjustment will be performed if the adjustment to any leadscrew would exceed that limit.
You can test how well it would work before you buy a DueX by using the manual bed levelling assistant, which uses the same code. See https://duet3d.com/wiki/Using_the_manual_bed_levelling_assistant.
