Grinding the bed with BLTouch

FreddyGaertner

Hi
I have recently installed a BlTouch clone on my A5 and i'm having Bed Grinding issues

I set up the mesh exactly like this:

M502            ; Reset settings to configuration defaults...
M500            ; ...and Save to EEPROM. Use this on a new install.
M501            ; Read back in the saved EEPROM.  

M190 S65        ; Not required, but having the printer at temperature helps accuracy
M104 S210       ; Not required, but having the printer at temperature helps accuracy

G28             ; Home XYZ.
G29 P1          ; Do automated probing of the bed.
G29 P3 T        ; Repeat until all mesh points are filled in.

G29 T           ; View the Z compensation values.
G29 S1          ; Save UBL mesh points to EEPROM.
G29 F 10.0      ; Set Fade Height for correction at 10.0 mm.
G29 A           ; Activate the UBL System.
M500            ; Save current setup. WARNING: UBL will be active at power up, before any `G28`.

Then i adjusted the Z-Offset like this:

G28
M851 Z0
M500
M501

moved the nozzle sligltly to the right so it's just over the bed

G28 Z
G1 F60 Z0
M211 S0

moved the nozzle down till i could barely move a 0.20mm feeler gauge
the LCD red Z-1.70 so i added the 0.20mm to get a Z-Offset of Z-1.90

M851 Z-1.90
M211 S1
M500
M501


next i did a test print by typing:  G26 B65 H210 F1.75 L0.2 S0.4

and the result i got is the following....

The white lines are all bed grinds...

If you know wahat could be the issue please let me know

Thanks

Samuel Pinches

Hi @FreddyGaertner ,

I think you may be missing the command to enable the mesh - "<a rel="nofollow" href="http://marlinfw.org/docs/gcode/M420.html">M420 S1</a>". I recommend you add this to your start script, after the G28. I could be wrong - I see you have G29 A, but the correct command to use depends on how your firmware is configured, whether you are using UBL or ABL.

Cheers, Sam

FreddyGaertner

That's weird, shouldn't it work right away with G29 A ? i have UBL

Anyway, i tried sending the  M420 S1 command before the G26 B65 H210 F1.75 L0.2 S0.4 and it worked !

Thanks a lot @Samuel Pinches !

I really apreciate your help in this Forum/Community. People like you make the Forum activities actually enjoyable 

Der_Muck

I recommend to set the Z offset in the firmware. Dont use valves set by gcode in the eeprom. One time a M502 and everything is gone. Use the eeprom g-code programming always to try things out and when it works, write the valves in the firmware. Only than the valves are permanent and dont get loose.

To set the BLtouch (clones have a risk to fail) like that in your slicer. Beginn of the starting skript is like:

M502 //you dont have to use it but it makes the printer free from other non permanent settings

M500 // works with the M502 dont set it without the M502 up there

G28

G29 P1

G29 P3 T

G29 T

G29 S1

G29 F 3

G29 A

M500

... and than your starting skript

That should work, when you now have a to low or to high nozzle, fine tune it in your slicer (im SP3D its in the filament process settings /gcode/global gcode settings/Z) Than you can easy see with a test print if it works, no need to do it with pronterface.

When its ok, set it permanent in the firmware again. (I didnt do that because I am working on my hotend so it is one time + and one time -)

FreddyGaertner

Thanks @Der_Muck
I set the Start Code like you suggested and it works great
Could you please explain how i set the z-offset in the firmware ?

Danke

Der_Muck

That sounds great
So soll es sein hehe

Did you ever edit something in the firmware yourself?
If yes, go to:




Than edit: 




Set the Offset as you found out. with -
Than save your edit firmware and send it to the A5. Be sure to unplug the displays ribbon cable!!!

FreddyGaertner

Ah ok that way
Yes i already edited the firmware to install the bltouch and the TMC2130
Thanks for the info