Correction of heightmap is not really working

fcwilt

@icy_snake said in Correction of heightmap is not really working:

@icy_snake also a macro to setup the z?

I was under the impression you had determined a good value for the Z parameter in G31.

As mentioned normal that value is "set and forget" unless your hardware changes.

I suppose I could code a macro to determine that value but as you know it is going to involve setting the physical Z position to some known value to serve as a reference.

Would you like to have such a macro?

Frederick

ICY_SNAKE

@fcwilt yes lets do a macro. so whenever i change my bed from glass to aluminium i can run a new setup

fcwilt

@icy_snake said in Correction of heightmap is not really working:

@fcwilt yes lets do a macro. so whenever i change my bed from glass to aluminium i can run a new setup

Is there are reason to think the correct value for each would be different every time you changed the bed material?

Frederick

ICY_SNAKE

@fcwilt said in Correction of heightmap is not really working:

o think the correc

yes, because the thickness of the buildplates are different.

also another question do i need the

G31 P500 x-18 y24 Z3.005

in the config.g and also in the config_probe.g??

fcwilt

@icy_snake said in Correction of heightmap is not really working:

yes, because the thickness of the buildplates are different.

I understand that but if the correct value for G31 is always the same for each buildplate you could just have a macro which sets the new value as opposed to determining the value each time.

G31 P500 x-18 y24 Z3.005

in the config.g and also in the config_probe.g??

What you should do is remove all three of the probe configuration commands from config.g and replace them with the M98 P"probe_config.g" command. That way the probe will be configured after a reboot or restart. Not essential but it insures the probe is ready to go if you were to issue a command like G30 from the DWC.

Frederick

ICY_SNAKE

@fcwilt ok

so i need only one macro to set the z, correct?

fcwilt

@icy_snake said in Correction of heightmap is not really working:

@fcwilt ok

so i need only one macro to set the z, correct?

If the value for each buildplate is constant you can eliminate editing of the probe_config.g file by using a global variable to hold the G31 Z Trigger Height value.

Then you can have one macro for each buildplate to set the variable to the correct value for that buildplate.

How does that sound?

Frederick

ICY_SNAKE

@fcwilt Yes that would be prefect

ICY_SNAKE

@icy_snake could you write that for me, please?

fcwilt

@icy_snake said in Correction of heightmap is not really working:

@fcwilt Yes that would be prefect

OK I will code that.

In the meantime here is the macro for measuring the Z probe trigger height - if you ever need it.

M300 S666 P666               ; beeo

M291 S3 R"Test Z Probe Trigger Height" P"Press OK to continue, or CANCEL to abort"

G28                          ; home all

G29 S2                       ; cancel mesh bed compensation
M290 R0 S0                   ; cancel baby stepping

G90                          ; absolute movements

; this complicated looking command computes the X and Y parameters needed to move the probe to the center of the bed

G1 X{((move.axes[0].max + move.axes[0].min) / 2) - sensors.probes[0].offsets[0]}, Y{((move.axes[1].max + move.axes[1].min) / 2) - sensors.probes[0].offsets[1]}, F1800

M300 S1111 P666              ; beep

M564 H1 S0                   ; ignore axis limits

M291 S2 R"Test Z Probe Trigger Height - Step 1" P"Place a paper sheet under the nozzle and raise the bed until slight friction can be noticed" Z1 ;

G92 Z0                       ; the nozzle should now be just touching the bed so set the logical Z position to match the physical Z position

M300 S666 P666               ; beep

M291 S2 R"Test Z Probe Trigger Height - Step 2" P"Please remove the paper sheet and wait for the bed-probing to begin" ;

G1 Z5 F200                   ; insure Z position will allow for probing

G30 S-1                      ; probe the bed and report the Z probe trigger height

M564 S1 H1                   ; respect axis limits

M291 S2 R"Test Z Probe Trigger Height - Step 3" P"Copy the reported height value on the G-Code console and paste it into the probe_config.g file"

fcwilt

@icy_snake

Add this near the start of your config.g:

global g_probe_z_trigger   = 1.8                ; default - set as appropriate for the Z probe

Just for reference this is what the start of my config.g file showing the section where I set all my global variables:

; ****************************************************************************************************
; prologue
; ****************************************************************************************************

M111 S0				; debug off

M550 P"MF1"			; machine name
;M551 P"xxxxxx"                 ; machine password

M555 P2                         ; set output to look like Marlin
M575 P0 B57600 S2               ; communication parameters for USB serial
M575 P1 B115200 S1              ; communication parameters for PanelDue

M552 S1                         ; enable (S1) networking (WiFi)
M586 S1 P1 ;T0                  ; enable (S1) FTP    (P1) Disable TLS (T0)
M586 S1 P2 ;T0                  ; enable (S1) Telnet (P2) Disable TLS (T0)

G21                             ; dimensions in mm
G90                             ; for X,Y,Z     use absolute coordinate values
M83                             ; for E0,E1,etc use relative coordinate values

; ****************************************************************************************************
; mode control variables
; ****************************************************************************************************

global g_z_home            = 5                  ; can be used to always move Z to known height
global g_z_datum_set       = false              ; can be used to prevent unneeded setting of Z=0 datum

global g_map_mode          = "300 point"        ; determines which kind of height map is created/loaded
global g_probe_mode        = "two consecutive"  ; determines if z proving used consecutive or averaging
global g_level_mode        = "3 point"          ; determines if 3 or 4 points are used for leveling

global g_print_beg_prime   = 10                 ; default - set desired in filament config.g
global g_print_beg_retract = 0                  ; default - set desired in filament config.g

global g_print_end_retract = 0                  ; default - set desired in filament config.g
global g_print_end_mode    = "heat off"         ; determines if heaters are turned off when print is done

global g_probe_z_trigger   = 1.8                ; default - set as appropriate for the Z probe

In your probe_config.g file update your G31 command to replace the value after the Z parameter with the variable reference shown below:

G31 P25 X0 Y24.5 Z{global.g_probe_z_trigger}  ; set Z probe trigger value, offset and trigger height (larger value is closer)

Create the macros to set the global variable to the needed values. Name them as you desire. Here is an example:

set global.g_probe_z_trigger = 1.8 ; set the variable

M98 P"probe_config.g"              ; configure the probe using the new value

; I put this G31 here just to show the current settings - it is optional
; You can provide visual feedback some other way, say, using an M291 command

G31

ICY_SNAKE

@fcwilt Whowww, many thanks Frederick,

perfect support, you helped me alot, thanks again.

I´m often in the USA for business. Maybe there will be a day that we could have some drinks.

Best Regards
Dieter

ICY_SNAKE

@icy_snake I´m already home today, here it´s evening.

I will add tomorrow the new code. I let you know if i could get it running.

Good evening
Dieter

fcwilt

@icy_snake said in Correction of heightmap is not really working:

I´m often in the USA for business. Maybe there will be a day that we could have some drinks.

Best Regards
Dieter

That would be grand but I am located in South West Virginia. The closet city is Roanoke to give you a reference.

Phaedrux

The trigger height for the BLTouch should stay the same between different build plates since it physically touches the build plate and the offset between the bltouch trigger point and the nozzle remains constant. That's one of the main benefits of a BLTouch.

fcwilt

@phaedrux

Yes it should. Hopefully this will be a good learning experience for Dieter.

Frederick

ICY_SNAKE

@fcwilt hahah yes it was and it is and will be in the future.

thx all for the perfect help here.

Dieter

fcwilt

@icy_snake

Morning.

Once you have verified that everything we have done on so far is working we can move on to the last piece of the puzzle - your "start" code - the code that is executed at the start of a print to get everything set as needed for a successful print.

Frederick

ICY_SNAKE

@fcwilt Good morning frederick,

here is my start gcode in ideamaker.

It works, need to do anything after i hit the start button:

<G28                         	; Home
M566 E3000		; max speed change
M572 D0 S0.07	        ; pressure calibration value 0.01 bis 0.12
G92 E0		        ; Reset the extruder
G0 Z20           	        ; Z down bei 20
G0 X0 Y0 F6000         ; Go to left front
G92 E0 
G1 E50 F350           	; Extrude 50mm speed 350,time to clean head 
G92 E0
G0 X100 Y10 F9000  ; Move quickly to X100 Y10, cut the string automaticly
G0 Z0.3                	; Lower Z to 0.3
G1 F1000 X200 E3 	; print line to x200 speed 1000 
G92 E0
G1 F800 E-0.3		; retract -0.3mm 
M117 Printing..the..new..model.>

Here is my End Gcode:

 <G1 F800 E-1.0	;retract filament 1.0mm to prevent oozing
 M104 S0 T0	 	; turn off hotend 1
 M104 S0 t1		; turn off hotend 1
 G90		                ; use absolute coordinates
 G28 X0 Y0	 	; Move to Home without Z
 M221 D0 S100 	; extrusion Factor back to 100
 M106 S0 T0    	         ; turn off fan 1
 M106 S0 T1		; turn off fan 2
 M84	 	                ; Switch off all Motors
 M117 Ready..with..the..new..model--have fun!>

Let me know what you think.

fcwilt

@icy_snake

I gather most of that code is for priming the extruder?

I don't see any code to:

set heater temp
set bed temp
load height map

Where is that being done?

Frederick