Auto Level Question/Issue?
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I forgot to mention I have Firmware Name:
RepRapFirmware for Duet 2 WiFi/Ethernet
Firmware Electronics:
Duet WiFi 1.02 or later + DueX5
Firmware Version:
1.21 (2018-03-21)
WiFi Server Version:
1.21RC4(08b3)
Web Interface Version:
1.21.2-dc42 -
If the motors are going out of sync you'll need a way to resynchronize them. End stops would be the easiest and most logical way. You could possibly use stall detection on the drivers to push them into a physical end stop until the motors all skip steps. But at some point the printer mechanics need to be true before any software compensation can work properly.
For example the height map from g29 is only valid when the mechanical setup of the printer is the same as when the height map was gathered.
Are you using this? https://duet3d.dozuki.com/Wiki/Bed_levelling_using_multiple_independent_Z_motors
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yes, went over it about 50 times, My mechanics are good, got a little issue with one rod slight wobble in it, but not till it's about 400mm, got a new rod coming, just waiting for it. I do get a difference of .09 in my height map after a large print. but because of my tempered glass bed, it has quite a few valleys in it, want to sync the motors all together(auto level) before auto compensation kicks in.
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Thanks for the reply and assistance
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When you run G32, does it probe the 4 points and then report the adjustments it made to the leadscrews?
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If yes, when you run g32 several times, do the corrections converge?
I think it's unlikely that a 12mm glass plate is flexible enough to work well with independent adjustment of 4 leadscrews, because it won't twist easily. You may be better off wiring 2 of the Z motors in series (e.g. by using the two Z motor connectors) and treating it as a 3-leadscrew system. But those 2 motors will still be liable to get out of sync when you cycle the power.
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dc42 administrators 06 Aug 2018 04:54
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When you run G32, does it probe the 4 points and then report the adjustments it made to the leadscrews?
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If yes, when you run g32 several times, do the corrections converge?
when I run g32 it does probe the 4 points but does not show me adjustments made in lead screw, it shows me a deviation and rms but no "leadscrew adjustment" as I've seen other people post. If it would make the adjustment and then when I run g29 s1, I should be good after that.I'm getting amazing quality and speed with weeks of fine tuning.
Also my bed does not move, its a moving gantry with x and y axis on it. the bed is stationary on the bottom of the machine. my gantry is made of aluminum extrusion
I've uploaded a file showing quality and of print and gantry
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oh I forgot to mention I take the deviation and manually adjust the screws before a print right now
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a better photo
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@jkdp, you have S0 in your M671 command, so you are telling it not to make any adjustments.
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I initially had it at 1 and still had no resultsm and I had read online through another forum that changing it from 1mm to 0 would make the leadscrew adjustment to 0,which also gave me no result, I will change that back to 1mm? or 3mm? and give it a try, I will have to try after this t-Rex skull from MakerBot is completed, unfortunately that won't be for a few days more as it's being printed at 370x370x600. I will give that a try and post my results this weekend. and pictures of the t-Rex skull. thanks you very much, for the help greatly appreciated.
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@jkdp the S value is the maximum correction to apply in mm. So S0 means no correction.
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ok my print finished. I've changed the S parameter in my config.g from (M671 X:-150:-150:800:800 Y-10:850:850:-10 S0) to (M671 X:-150:-150:800:800 Y-10:850:850:-10 S3) and when I run the autolevel (g32) still no corrections are made to leadscrews it only shows me in my g-code console "Bed equation fits points [25.0, 25.0, -0.047] [25.0, 720.0, 0.219] [650.0, 720.0, 0.641] [650.0, 25.0, 0.391]" the paramaeters do not change no matter how many times I run it.
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finished print - t-rex skull by MakerBot
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@jkdp said in Auto Level Question/Issue?:
ok my print finished. I've changed the S parameter in my config.g from (M671 X:-150:-150:800:800 Y-10:850:850:-10 S0) to (M671 X:-150:-150:800:800 Y-10:850:850:-10 S3) and when I run the autolevel (g32) still no corrections are made to leadscrews it only shows me in my g-code console "Bed equation fits points [25.0, 25.0, -0.047] [25.0, 720.0, 0.219] [650.0, 720.0, 0.641] [650.0, 25.0, 0.391]" the paramaeters do not change no matter how many times I run it.
The S parameter in the last G30 command in bed.g needs to match the number of leadscrews. You must be using S3 in that command, but you need S4 because you have 4 leadscrews according to your M671 command. So it's doing old-style 3-point bed compensation instead.
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I already have the s4 command
m561
G28 ; home
M401 ; deploy Z probe
G30 P0 X5 Y5 Z-99999 ;probe near front right (FR) lead screw
G30 P1 X5 Y720 Z-99999 ;probe near rear right (RR) lead screw
G30 P2 X650 Y720 Z-99999 ;probe near real left (RL) lead screw
G30 P3 X650 Y5 Z-99999 S4 ;probe near a front left (FL)
G30 p4 X325 Y350 z-99999
M402 ; retract probe
G29 S1 -
ok for reference I just attempted it this way, and also got no leadscrew adjustment.
m561
G28 ; home
M401 ; deploy Z probe
G30 P0 X5 Y5 Z-99999 ;probe near front right (FR) lead screw
G30 P1 X5 Y720 Z-99999 ;probe near rear right (RR) lead screw
G30 P2 X650 Y720 Z-99999 ;probe near real left (RL) lead screw
G30 P3 X650 Y5 Z-99999 ;probe near a front left (FL)
G30 p4 X325 Y350 z-99999 S4
M402 ; retract probe
G29 S1 -
@jkdp That print turned out quite well!
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@jkdp said in Auto Level Question/Issue?:
ok for reference I just attempted it this way, and also got no leadscrew adjustment.
m561
G28 ; home
M401 ; deploy Z probe
G30 P0 X5 Y5 Z-99999 ;probe near front right (FR) lead screw
G30 P1 X5 Y720 Z-99999 ;probe near rear right (RR) lead screw
G30 P2 X650 Y720 Z-99999 ;probe near real left (RL) lead screw
G30 P3 X650 Y5 Z-99999 ;probe near a front left (FL)
G30 p4 X325 Y350 z-99999 S4
M402 ; retract probe
G29 S1But was that with
M671 X:-150:-150:800:800 Y-10:850:850:-10 S4in config.g? -
Yes I had s4 and still not getting any leadscrew adjustments only the "Bed equation fits points [0.0, 0.0, 0.026] [0.0, 720.0, -0.016] [650.0, 720.0, 0.155] [650.0, 0.0, 0.018]" parameter.
They've been turning out pretty good, a few settings left to adjust with the retraction settings and have a slight wobble in 2 screws, have 2 more coming in, just waiting to change them out.
thanks -
I think I need to ask for clarification on what you're expecting to happen, because I'm not sure really.
You say you want to get your motors back into sync, but don't want to home to zmax with endstops due to the time it takes to travel.
You're using G32 to run bed.g before a print and loading a heightmap for grid compensation with g29 s1.
What are you expecting G32 (bed.g) to do? When it runs do you see the z motors turning at all?
When the print starts, do you see the z motors turning to compensate for the bed surface? (G29)
