mesh bed compensation
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@tom33
I probe directly with the head of the machineextract of config g
; Tools M563 P0 S"E0" D0 H1 F0 ; Define Extruder 0 drive 0 Heater 1 Fan 0 G10 P0 X-30.4 Y0 Z-30.620 ; Set offset G10 P0 R0 S0 ; Reset initial tool 0 active and standby temperatures to 0C G10 L2 P1 X37.60 Y20.00 Z0 M500 M558 P5 C"io4.in" H7.5 F300 T6000 G31 P500 X0 Y0 Z-2.35 ; set Z probe trigger value, offset and trigger height -
@tom33
start.gM42 P0 S0 M98 P/macros/Machine/Safety/03_Porte.g M98 P/macros/myUpTimePrint.g ;G28 G29 S1 -
@tom33 I have also tried with
G31 P500 X-30.4 Y0 Z-2.35 ; ``` -
I will be glad to help but I need to study your code.
One thing I will mention now before I get into studying your code:
The developers have this in mind for using G32 and G29:
G32 will run bed.g.
G29 will run mesh.g.
In bed.g there should be the code for leveling the bed.
In mesh.g there should be the code for creating the height map that is needed for mesh bed compensation.
Bed Leveling and Mesh Bed Compensation are two totally different things.
You have put the code for using mesh bed compensation in the file bed.g. While this will work it is not as intended. There are commands in the DWC that expect the conventional use of bed.g and mesh.g.
It's your printer and naturally you are free to do whatever you like.
Now I am off to study your code. In the meantime could you post the image of your height map?
Thanks.
Frederick
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Please post your entire config.g file.
A few things to consider:
- once you have homed your printer it should stay homed unless something goes wrong.
- before creating the height map with G29 you should set the Z=0 Datum with G30 at some fixed position - I use the center of the bed.
- before loading the height map with G29 S1 you should again set the Z=0 Datum as before.
- you should create the height map with the bed at the temperature you are going to print at. I let the bed heat for at least 30 minutes before creating the height map.
- once you have created the height map you should not need to re-create it unless something goes wrong.
Question: You have a G30 S-2 command in your bed.g file. Why is that?
Frederick
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@fcwilt I'm not runing a G30 before each print
The G30 S-2 is to save the tool Z offset in the config-override
And when I'm doing the height map, the bed is well heated
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@tom33 said in mesh bed compensation:
@fcwilt I'm not runing a G30 before each print
It needs to be done at the times I posted.
The G30 S-2 is to save the tool Z offset in the config-override
Tool offsets only apply to multi-tool printers. Is that what you have?
And when I'm doing the height map, the bed is well heated
That is good.
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@fcwilt Yes I have two tool heads in the machine
I don't understand where I have to move the G30 S-2 ?
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@tom33 said in mesh bed compensation:
@fcwilt Yes I have two tool heads in the machine
I don't understand where I have to move the G30 S-2 ?
So it's not a tool changing printer but tools are always present?
Frederick
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@fcwilt Yes, I have just a system to up and down the second tool head
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@tom33 said in mesh bed compensation:
@fcwilt Yes, I have just a system to up and down the second tool head
As you understand the firmware needs to know the locations (X, Y, Z) of the Z probe and the tools, relative to one another.
With a single tool system the tool XYZ offsets are the reference (all zero) and the Z probe offsets/trigger height are set as appropriate.
Typically with a multi-tool system the Z probe is the reference (offsets/trigger height all zero) and the tool XYZ offsets are set as appropriate.
Your are combining both approaches - which will work - it is just unusual.
Where did you get the code in BED.G - there is much there that I don't understand.
When configuring your tools you have G10 L2 P1 X37.60 Y20.00 Z0. Why the L2?
Thanks.
But back to your original problem. Have you updated start.g to include a G30 before the G29 S1? Recall that the G30 used to set the Z=0 Datum should always be at the same XY machine position.
Frederick
