Dual Z bed leveling using BLTouch
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Since I'm utilizing a second stepper driver for the second z leadscrew, do I need to add to my existing settings like motor currents, accelerations, instantaneous speed changes with a colon after the z-setting or since both motors are for the z-axis does the single setting stand?
Below is what I was wondering if I had to do
M92 X200.00 Y200.00 Z1600.00:1600.00 E846.00 ; Set steps per mm
M566 X900.00 Y900.00 Z12.00:12.00 E1200.00 ; Set maximum instantaneous speed changes (mm/min
M203 X10000.00 Y10000.00 Z180.00:180.00 E10000.00 ; Set maximum speeds (mm/min)
M201 X500.00 Y500.00 Z20.00:20.00 E1500.00 ; Set accelerations (mm/s^2)
M906 X1600.00 Y1600.00 Z1600.00:1600.00 E960.00 I30 ; Set motor currents (mA) and motor idle factor in per cent -
no the z settings will apply to all if your M584 is correct
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@veti Thanks again.
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I'm getting close to hooking up my Duet to my new printer and after thinking about this setup, can mesh bed leveling still be used when syncing up the dual z-leadscrews? The reason I ask is that the bed.g file has to be changed for the dual z sync and I would assume the G29 command has to be removed/commented out for the two G30 commands to be performed.
I don't want to run mesh bed compensation every time I turn on the printer and for all I know I may not need to now that I have a MIC-6 bed but it will have a Wham Bam magnetic plate on it so I'm sure that won't be perfectly flat.
This is what I "assume" my bed.g needs to be for the dual-z sync
G28 ; home
M561 ; clear any bed transform
G30 P0 X20 Y170 Z-99999 ; probe near a leadscrew, half way along Y axis
G30 P1 X300 Y170 Z-99999 S2 ; probe near a leadscrew and calibrate 2 motors -
it depends.
if your bed is perfectly flat then the G32 that does the z adjustment is fine.if its not perfectly flat then the G32 will move the bed in such a way as to minimize the deviation.
the mesh bed levelling G29 will is still required to compensate for the flatness of the bed itself. -
So do I have to leave the G29 in the bed.g file or can I just call it from DWC manually entering it on the top as long as I have the grid settings defined in my config.g file with the M557 define mesh grid?
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i call G29 from the initial G Code for printing and do the G32 z adjustment manually from time to time.
You could also do G32 and G29 in the initial printing g code if the extra time does not bother you. -
Well I need to get that G32 out of the config.g file...I made a change to the config remotely while at work which rebooted the duet and there were prints on the bed from last night that finished after I left for work this morning. Now I can't re-connect to the printer and it must be hammering against the prints trying to re-home.
Guess I'll put it at the end of the homeall file instead.
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Hi James, have you managed to resolve this? I have just started looking into this feature of having an independent Z axis leveling, but also using the BLTouch.
Miloš
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@MilošS I have it working fine but I am not home to be able to post up config.g or bed.g. I'm now using a triple z setup on my corexy printer for the bed.
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