Z calibration offset

fcwilt

@fcwilt Ok will do that

Great.

It looks like you attempted to post an updated homeall.g file but something went wrong.

Frederick

Thunder

; homeall.g
; called to home all axes
;
; generated by RepRapFirmware Configuration Tool v2.1.8 on Sun May 24 2020 20:05:38 GMT+0200 (Central European Summer Time)
G91                      ; relative positioning
G1 H2 Z10 F24000          ; lift Z relative to current position
G1 H1 X-505 Y-505 F12000 ; move quickly to X and Y axis endstops and stop there (first pass)
G1 H2 X5 Y5 F24000       ; go back a few mm
G1 H1 X-505 Y-505 F240   ; move slowly to X and Y axis endstops once more (second pass)
G1 H1 Z-505 F240         ; move Z down stopping at the endstop
G90                      ; absolute positioning
G1 X100 Y100 F2000 ; put head over the centre of the bed, or wherever you want to probe
G30 ; lower head, stop when probe triggered and set Z to trigger height

; Uncomment the following lines to lift Z after probing
G91                     ; relative positioning
G1 Z10 F400              ; lift Z relative to current position
G90                     ; absolute positioning

Here is my file, also i dont understand "Where is the your code to create the height map?" ? I was folowing this guide :link text

fcwilt

@fcwilt said in Z calibration offset:

M574 Z 1

I don't use v2 firmware but I think that command above should be M574 Z1 S2

Frederick

fcwilt

@Thunder said in Z calibration offset:

G1 X100 Y100 F2000 ; put head over the centre of the bed, or wherever you want to probe
G30 ; lower head, stop when probe triggered and set Z to trigger height

I don't think X100 Y100 is going to put your probe over the center of the bed which is really the best place.

i dont understand "Where is the your code to create the height map?" ?

I guess you are issuing the G29 command from the DWC?

Thunder

Yes, this is right. Ok, came home and started the machine and a couple of settings were wrong. Now I have managed the home all to touch the probe for z and started the G29 S0
but I still get the same result. Can anybody point out what I am doing wrong? I am new to programming and this kind of setup.

System
My Printer
g29 s0
Status
Busy
Tool Position
X
346.4
Y
320.2
Z
7.15
Extruder Drives
Drive 0
0.0
Speeds
Requested Speed
3 mm/s
Top Speed
3 mm/s
Sensors
Vin
12.0 V
MCU Temperature
28.4 C
Fan RPM
0
Z-Probe
0
 Tools
 Extra
 Control All
Tool	Heater	Current	Active	Standby
Tool 0 
T0 - Load Filament	Heater 1 
off	16.9 C	
0
0
Bed	Heater 0 
off	18.2 C	
0
0
Temperature Chart
System Directory
0:/sys/config.g
; Configuration file for Duet WiFi (firmware version 2.03)
; executed by the firmware on start-up
;
; generated by RepRapFirmware Configuration Tool v2.1.8 on Sun May 24 2020 20:05:38 GMT+0200 (Central European Summer Time)

; General preferences
G90                                                ; send absolute coordinates...
M83                                                ; ...but relative extruder moves
M550 P"My Printer"                                 ; set printer name

; Network
M551 P"GoBevk"                                     ; set password
M552 S1                                            ; enable network
M586 P0 S1                                         ; enable HTTP
M586 P1 S0                                         ; disable FTP
M586 P2 S0                                         ; disable Telnet

; Drives
M569 P0 S0                                         ; physical drive 0 goes backwards
M569 P1 S0                                         ; physical drive 1 goes backwards
M569 P2 S1                                         ; physical drive 2 goes forwards
M569 P3 S1                                         ; physical drive 3 goes forwards
M584 X0 Y1 Z2 E3                                   ; set drive mapping
M350 X16 Y16 Z16 E16 I1                            ; configure microstepping with interpolation
M92 X160.00 Y80.00 Z800.00 E837                   ; set steps per mm
M566 X900.00 Y900.00 Z12.00 E120.00                ; set maximum instantaneous speed changes (mm/min)
M203 X6000.00 Y6000.00 Z180.00 E1200.00            ; set maximum speeds (mm/min)
M201 X500.00 Y500.00 Z20.00 E250.00                ; set accelerations (mm/s^2)
M906 X1400 Y1700 Z1400 E800 I50                    ; set motor currents (mA) and motor idle factor in per cent
M84 S50                                       ; Set idle timeout

;Bl-touch heaters
M307 H3 A-1 C-1 D-1                                ; disable heater on PWM channel for BLTouch

; Axis Limits
M208 X0 Y0 Z0 S1                                   ; set axis minima
M208 X500 Y500 Z500 S0                             ; set axis maxima

; Endstops
M574 X1 Y1 S1;                                   ; set active high endstops
M574 Z1 S2;


; Z-Probe
M558 P9 H5 F500 T4000 X0 Y0 Z1                     ; set Z probe type to bltouch and the dive height + speeds
G31 P500 X-66.4 Y-10.2 Z2.15                       ; set Z probe trigger value, offset and trigger height
M557 X70:433.6 Y70:498.8 S30                           ; define mesh grid

; Heaters
M305 P0 T100000 B4138 R4700                        ; set thermistor + ADC parameters for heater 0
M143 H0 S120                                       ; set temperature limit for heater 0 to 120C
M305 P1 T100000 B4138 R4700                        ; set thermistor + ADC parameters for heater 1
M143 H1 S280                                       ; set temperature limit for heater 1 to 280C

; Fans
M106 P0 S0 I0 F500 H-1                             ; set fan 0 value, PWM signal inversion and frequency. Thermostatic control is turned off
M106 P1 S1 I0 F500 H1 T45                          ; set fan 1 value, PWM signal inversion and frequency. Thermostatic control is turned on

; Tools
M563 P0 D0 H1 F0                                   ; define tool 0
G10 P0 X0 Y0 Z0                                    ; set tool 0 axis offsets
G10 P0 R0 S0                                       ; set initial tool 0 active and standby temperatures to 0C



; Custom settings are not defined

; Miscellaneous
M911 S10 R11 P"M913 X0 Y0 G91 M83 G1 Z3 E-5 F1000" ; set voltage thresholds and actions to run on power loss

; homeall.g
; called to home all axes
;
; generated by RepRapFirmware Configuration Tool v2.0.4 on Sun Sep 15 2019 21:01:39 GMT+0200 (Central European Summer Time)
G91 ; relative positioning
G1 Z5 F6000 S2 ; lift Z relative to current position
G1 S1 X-500 Y-500 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-235 Y-215 F360 ; move slowly to X and Y axis endstops once more (second pass)
G90 ; absolute positioning
G1 X250 Y250 F6000 ; go to first bed probe point and home Z
G30 ; home Z by probing the bed
; Uncomment the following lines to lift Z after probing
G91 ; relative positioning
G1 S2 Z20 F100 ; lift Z relative to current position
G90 ; absolute positioning

Thanks in advance

Thunder

And here is the picture

fcwilt

@Thunder said in Z calibration offset:

G1 X250 Y250 F6000 ; go to first bed probe point and home Z

For now that G1 command above is OK but it doesn't take into account the z probe X and Y offsets - so you're getting close to the center of the bed but you're not at the center.

You have to be sure that G30 is setting the Z co-ordinate correctly before G29 will work as desired.

So do the following:

After the G30 in homeall.g comment out the G91 and the G1 commands.

Run homeall.g and see what the Z co-ordinate readout in the DWC is after the execution of G30.

Verify that it is correct either by measuring the gap between the nozzle and the bed OR jog down to Z=0 and see if the nozzle is just touching the bed.

Let me know what you find.

Frederick

Thunder

Ok, I have now managed the calibration. But when I start the program from the slicer I get the Error: M375: Heightmap file bareplate.csv not found I think this means my startup code is not ok

thank you

fcwilt

@Thunder

Well you must have a command somewhere like this G29 S1 P"bareplate.scv".

For that to work at some point you would have to created that file with G29 S3 P"bareplate.csv".

Did you do so?

Frederick

Thunder

@fcwilt

Ok i checked and you are right. In the startup i had a M375 command. I deleted the line and replaced the command with G29 S1. And now my next question if load the g code of a part for printing the machine homes and makes the printer use the height map that i did eariler with G29 S0. But my nozzle is stil a few 0.1 mm from build plate. Do i correct this with baby steps ?

Thanks for all of your input

fcwilt

@Thunder said in Z calibration offset:

And now my next question if load the g code of a part for printing the machine homes and makes the printer use the > height map that i did eariler with G29 S0. But my nozzle is stil a few 0.1 mm from build plate. Do i correct this with baby

Refresh my memory please.

When creating the height map do you have commands something like these:

G90
G1 Xaaa Ybbb ; move the z probe to the center of the bed
G30          ; set the Z=0 datum
G29          ; probe the bed and create the height map

When loading the height map do you have commands something like these:

G90
G1 Xaaa Ybbb ; move the z probe to the center of the bed
G30          ; set the Z=0 datum
G29 S1       ; load the height map

Frederick

Thunder

@fcwilt

Yes like the last one, this code is in slicer start program.

fcwilt

@Thunder said in Z calibration offset:

@fcwilt

Yes like the last one, this code is in slicer start program.

Great.

How about when creating the height map?

The G30 for creating and loading need to use the exact same X and Y position.

Frederick

Thunder

Do you mean in the home all section? Sorry I am a little slow when programing

fcwilt

@Thunder said in Z calibration offset:

Do you mean in the home all section? Sorry I am a little slow when programing

I don't know where you create the height map.

I have a pair of files that I created called mech_comp_map_create.g and mesh_comp_map_load.g.

The first is invoked from a DWC macro as I create the height map manually.

The second is invoked from another file that I created called print_begin.g which is invoked by the slicer at the start of a print.

The essential commands in mech_comp_map_create.g are below

G90
G1 Xaaa Ybbb ; move the z probe to the center of the bed
G30          ; set the Z=0 datum
G29          ; probe the bed and create the height map

The essential commands in mech_comp_map_load.g are below

G90
G1 Xaaa Ybbb ; move the z probe to the center of the bed
G30          ; set the Z=0 datum
G29 S1       ; load the height map

The important thing to notice is that G30 must be used before creating (G29) or loading (G29 S1) the height map.

Frederick