Improving mesh bed compensation with M558 HX

Phaedrux · 7 Sept 2020, 18:11

@deonholt said in Improving mesh bed compensation with M558 HX:

@sykb what settings do you use to tell the probing to only probe 9 points? I would like to have that as well. Mine is currently probing about 42 points and I have a glass bed.

In M557 you use either S or P parameters to tell it the spacing of the points, or the number of points. So if you want 9 points, use P3:3 which will probe a 3x3 grid.

deonholt · 7 Sept 2020, 18:13

@Phaedrux said in Improving mesh bed compensation with M558 HX:

@deonholt said in Improving mesh bed compensation with M558 HX:

@sykb what settings do you use to tell the probing to only probe 9 points? I would like to have that as well. Mine is currently probing about 42 points and I have a glass bed.

In M557 you use either S or P parameters to tell it the spacing of the points, or the number of points. So if you want 9 points, use P3:3 which will probe a 3x3 grid.

Great! Thank you so much.

deonholt · 7 Sept 2020, 18:26

@Phaedrux said in Improving mesh bed compensation with M558 HX:

In M557 you use either S or P parameters to tell it the spacing of the points, or the number of points. So if you want 9 points, use P3:3 which will probe a 3x3 grid.

I tried this but it gave some error:
M557 P3:3 ; define mesh grid 3x3
I think I' missing something to tell it to save it. (I'm learning.)

Thanks.

fcwilt · 7 Sept 2020, 18:57

@deonholt said in Improving mesh bed compensation with M558 HX:

I tried this but it gave some error:
M557 P3:3 ; define mesh grid 3x3
I think I' missing something to tell it to save it. (I'm learning.)

Thanks.

You still have to include the X and Y min/max values.

Frederick

Phaedrux · 9 Jul 2020, 19:00

@deonholt When in doubt check the gcode wiki.

https://duet3d.dozuki.com/Wiki/Gcode#Section_M557_Set_Z_probe_point_or_define_probing_grid

https://duet3d.dozuki.com/Wiki/Using_mesh_bed_compensation#Section_Define_the_mesh_size_and_spacing

peter247 · 7 Sept 2020, 21:47

@Phaedrux

Not seen sykb on , But I can see lots of faults .
Can't tell what printer he has , but to me the off sets or wrong , the homing files are wrong , and he is not probing the centre of the bed.

illy · 8 Sept 2020, 06:29

Thank you everyone for your response and sorry for my slow response. I'll try all your suggests.

@peter247 yes, the off set is correct. I can show you a picture.

@Veti yes, I have not changed it. I just wanted to show you how it looks with 9 points. I'll update the firmware first to 2.05.1 and try with S10 or S15, as you suggested.

@Phaedrux I've tried adding M558 A parameter in 2.02 and didn't get a better result. I'll try it again but in 2.05.1.

I'm using an inductive sensor as probe. You can also see it on the picture above.

@deonholt yes, you also have to define the X and Y min and max values, as @fcwilt said.

illy · 8 Sept 2020, 08:51

@Veti I've tried S30 (49 points) in RRF 2.05.1 and this is the result:

And then I did a test print but got the same result as before.

@Phaedrux I've changed the code to S30 in the M557 command and to H10 A6 S0.01 in the M558 command, but there is still no improvement. I've also tried removing the M564 commands in the homing files, as you suggested, but after that I could not home Z at all and got an error report saying: Error: G0/G1: insufficient axes homed.

And this the height map with the changed parameter:

peter247 · 9 Aug 2020, 08:56

@sykb

Your homing could be simpler :-
This is mine !!!

 ; homeall.g
; called to home all axes
;
G91               ; relative positioning
G1 H2 Z5 F6000    ; lift Z relative to current position
G1 H1 X 355 F3000 ; move quickly to X axis endstop and stop there (first pass)
G1 H1 Y 355 F3000 ; move quickly to Y axis endstop and stop there (first pass)
G90               ; absolute positioning
G1 X220 Y175 F4000 ; Move probe to middle of bed 350 x 350 
G30

I only do a single pass homing on X and Y , don't care if it is a fraction out.

What is your printing area ? , and can the probe go to the edges of the printing area without hitting the sides or hitting the limits ?

illy · 8 Sept 2020, 09:10

@peter247 250x210x325 mm. Yes, the probe can go outwards without hitting anything.

peter247 · 9 Aug 2020, 09:40

@sykb

I can't see anything wrong with your height map .

First you do need to level your bed , and after looking at your height map do a little adjusting to get it right.

Mesh levelling looks at your bed and adjusts while printing , it does not level your bed !!!!

This is my map .

illy · 9 Aug 2020, 11:25

@peter247 the problem is the mesh bed compensation. It seems to not be working correctly or maybe not working at all. I've tried varying the H parameter in the M558 command but I always got the same test print result. No improvement. "A large dive height could tolerate a very uneven bed or poor calibration". But it doesn't work for me.

peter247 · 9 Aug 2020, 12:19

@sykb

M558 command but I always got the same test print result. No improvement.

What do you mean by a print a real physical print with filament or running the mesh bed compensation routine ?

What is wrong with your test print can you show a picture so we can see what your problem is ? ( the first layer )

I've tried varying the H parameter in the M558

The wind direction outside or your house number will do the same affect as the H in the M558 , the H is just the height it will go to after each probe.

Mesh levelling looks at your bed and adjusts while printing , it does not level your bed !!!!

Veti · 8 Sept 2020, 13:21

@peter247 said in Improving mesh bed compensation with M558 HX:

Mesh levelling looks at your bed and adjusts while printing , it does not level your bed !!!!

given a head with enough force it might be possible to physically level the bed

peter247 · 9 Aug 2020, 13:35

@Veti

Not funny , I've done that once !!!!
o.k more than once .

illy · 9 Aug 2020, 14:29

@peter247 yes a real physical print with filament. This is the test print of the first layer. Thank you for your support so far, I really appreciate it

You can see the print quality difference in some position in the pictures below. I did not see any mesh bed compensation applied there that compensated the uneven bed. (please tell me, if I'm wrong)

As you can see in the first picture (right side), there is a huge quality difference between above and below.

Right side:

left side:

peter247 · 9 Aug 2020, 15:47

I think it is working due to the stagger in the skirt !!!!
The bigger the stagger the bigger the fault , so it is working but getting it wrong.

one point are you running the mesh bed compensation at full working temp eg a bed temperature of 60c

Phaedrux · 8 Sept 2020, 20:43

@sykb said in Improving mesh bed compensation with M558 HX:

homeall.g:
G91 ; relative positioning
G1 Z5 F6000 S2 ; lift Z relative to current position
G1 S1 X-382 Y-457 F1800 ; move quickly to X and Y axis endstops and stop there (first pass)
G1 X5 Y5 F6000 ; go back a few mm
G1 S1 X-382 Y-457 F360 ; move slowly to X and Y axis endstops once more (second pass)
G90 ; absolute positioning
M564 S0 H0
G1 X33.5 Y27 Z15 F6000 ; go to first bed probe point and home Z
M564 S0 H1
G30 ; home Z by probing the bed
homez.g:
G91 ; relative positioning
G1 Z5 F6000 S2 ; lift Z relative to current position
G90 ; absolute positioning
M564 S0 H0
G1 X33.5 Y27 Z15 F6000 ; go to first probe point
M564 S0 H1
G30 ; home Z by probing the bed

@sykb said in Improving mesh bed compensation with M558 HX:

I've also tried removing the M564 commands in the homing files, as you suggested, but after that I could not home Z at all and got an error report saying: Error: G0/G1: insufficient axes

At what point are you getting the insufficient axes homed error? It's basically telling you that you are trying to move an axis before it is homed. The proper way to do this, is to either home the axis first, or if it's for something like a Z axis lift to clear the nozzle and the bed you can use an S2/H2 switch on the G1 command to allow an unhommed move. Much safer than just a blanket allow unhomed moves with M564.

If the error is happening before that G1 move to place the probe in the center of the bed something is wrong because in homeall the x and Y axis should already be homed. If it's from using homez by itself, then yes, it will give an error if the X and Y aren't already homed. You can't guarantee the position so it's not going to let you move to an absolute position if it doesn't know where it is in absolute coordinate space. Forcing to allow it to move is just asking for a crash.

Also, your homing files are still using S1. Now that you've updated the firmware you should switch to using H1/H2 (S is being used for laser power when in laser mode.)

Can you post your full config.g?

illy · 9 Sept 2020, 06:44

@peter247 I always ran G29 S0 at full working temperature. 220c extruder temperature and 60c bed temperature. That's correct, right?
@Phaedrux I tried to home Z with G28 Z command and it reported an error. This is my full config.g:

; Communication and general
M575 P1 B57600 S0 ; Baud rate
M111 S0 ; Debug off
M550 PDISCOVERY ; Machine name

; Networking
M552 S0
M586 P0 S1 ; Enable HTTP
M586 P1 S0 ; Disable FTP
M551 Preprap ; Machine password
M586 P2 S0 ; Disable Telnet

; Ethernet networking: Adjust the IP address and gateway in the following 2 lines to suit your network
M552 P0.0.0.0 ; (0 = DHCP)
M554 P192.168.169.255 ; Gateway
M553 P255.255.255.0 ; Netmask

; Basic Settings
M555 P0 ; Set output to look like RepRap_Firmware
G21 ; Work in millimetres
G90 ; Send absolute coordinates
M83 ; but relative extruder moves

M208 X-39 Y-10 Z0.0 S1 ; Set axis minima
M208 X300 Y220 Z320 S0 ; Set axis maxima

M143 H1 S295 ; Max. Extruder temp
M143 H0 S125 ; Max. Heatbed temp

; Endstops
M574 X1 Y1 S1 ; Set endstops at low side, active high endstop input
M574 Z0 S2 ; Z endstop at low end, Z probe is used

M558 P5 X0 Y0 Z1 I0 H5 A3 F120 T6000 ; Set Z probe type

G31 P600 X32.7 Y35 Z0.5 ; Set Z probe trigger NEW
M557 X67:270 Y75:265 S101.5:90 ; Define mesh grid NEW

; Axis and motor configuration
M667 S0 ; Set Cartesian Mode

; Achsen Motor Richtung
M569 P0 S0 ; Drive 0 goes backwards
M569 P1 S1 ; Drive 1 goes forwards
M569 P2 S1 ; Drive 2 goes forwards

; Extruder Motor Richtung
M569 P3 S1 ; Drive 3 goes forwards
M569 P4 S1 ; Drive 4 goes forwards

M350 X256 Y256 Z256 E16:16 I1 ; Set 16x microstepping with interpolation
M92 X1600 Y1600 Z8533 U1600 ; Set axis steps/mm
M92 E2700:2700
;M92 E1800:1800
M906 X1100 Y1100 Z900 E500 I30 ;E855 I30 ; Set motor currents (mA) and motor idle factor to 30%
M201 X2000 Y2000 Z500 E120 ; Accelerations (mm/s^2)
M203 X30000 Y30000 Z1200 E1200;E3000 ; Maximum speeds (mm/min)
M566 X900 Y900 Z12 E40:40 ; Maximum instant speed changes mm/minute

; Thermistors
M307 H0 A86.5 C432.2 D6.4 I0 B0 S1.0 V12.0

;M140 H-1 ;tells the firmware, there is no bed termistor

; Put your own H and/or L values here to set the bed thermistor ADC correction
M305 P0 T100000 B3950 R4700 H30 L0

; Put your own H and/or L values here to set first nozzle thermistor ADC correction
M305 S"Extruder0" P1 T100000 B4725 R4700 H30 L0 C7.06e-8

; Put your own H and/or L values here to set 2nd nozzle thermistor ADC correction
M305 S"Extruder1" P2 T100000 B4725 R4700 H30 L0 C7.06e-8

; Fans
M106 P0 S1.0 I0 H1 T45 ; Set fan 0 value, PWM signal inversion and frequency. Thermostatic control is turned on; davor 500
M106 P1 S1.0 I0 H2 T45 ; Set fan 1 value, PWM signal inversion and frequency. Thermostatic control is turned on

M106 P2 S1.0 I0 F500 H-1 ; Set fan 2 value, PWM signal inversion and frequency. Thermostatic control is turned off
M106 P3 S1.0 I0 F500 H-1 ; Set fan 3 value, PWM signal inversion and frequency. Thermostatic control is turned off

M106 P4 S1.0 I0 F500 H-1 ; Set fan 4 value, PWM signal inversion and frequency. Thermostatic control is turned off

M106 P2 S0
M106 P3 S0

; Tool definitions
M563 P0 D0 H1 F2 S"Extruder0" ; Define tool 0
G10 P0 R0 S0 ; Set tool 0

M563 P1 D1 H2 F3 S"Extruder1" ; Define tool 1
G10 P1 R0 S0 ; Set tool 1

; Definiert den X Offset
G10 P0 X-32.7 L1 ; tool 0 offset
G10 P1 X32.7 L1 ; tool 1 offset

; Prepare magnet control pins
;M307 H4 A-1 C-1 D-1 ; Heater 4 off for freeing the pin
;M307 H5 A-1 C-1 D-1 ; Heater 4 off for freeing the pin
;M42 P4 S0 ; switch on the magnet
;M42 P5 S0

M208 S1 Z-0.2 ; set minimum Z

; Filament Sensor 0
M591 D0 P2 S1 C3

; Filament Sensor 1
M591 D1 P2 S1 C4

; SERVOS SETUP
M307 H6 A-1 C-1 D-1
M307 H7 A-1 C-1 D-1
M42 P6 S0
M42 P7 S0

M570 H1 P3000 T50
M570 H2 P3000 T50

M98 P/macros/OVERRIDE_CFG_MACRO ;Run override macro of webinterface

M98 P/macros/OVERRIDE_EXTRUDER_MACRO_0 ;Run override macro of webinterface for tools

M98 P/macros/OVERRIDE_EXTRUDER_MACRO_1 ;Run override macro of webinterface for tools

M572 D0:1 S0.2 ;Pressure advance

G28

M98 P/macros/T_freeAll ;Free all Tools

M98 P/macros/OVERRIDE_NETWORK_MODE ;Run override macro for network

Phaedrux · 9 Sept 2020, 06:23

@sykb said in Improving mesh bed compensation with M558 HX:

I tried to home Z with G28 Z command and it reported an error.

Yes trying to home just Z without first homing X and Y will lead to an error as I described. Does it give the error if you have X and Y homed prior?

	; homeall.g
	; called to home all axes
	;
	G91 ; relative positioning
	G1 H2 Z5 F6000 ; lift Z relative to current position
	G1 H1 X 355 F3000 ; move quickly to X axis endstop and stop there (first pass)
	G1 H1 Y 355 F3000 ; move quickly to Y axis endstop and stop there (first pass)
	G90 ; absolute positioning
	G1 X220 Y175 F4000 ; Move probe to middle of bed 350 x 350
	G30