Hi

I have an capacitive sensor installed on my PRUSA I3 but I noticed that Z positionning is not quite precise, I need three or four departure before it find the good level (perhaps warming), while optical endstop always give a good start.

if correct Z positionning, with auto levelling, is not easy to find when Ok the adherence is improved.

Can anyboby tell me how to configure Marlin in order to:
- Use my capacitive sensor to memorise auto levelling data
- use levelling matrix to correct surface defaults and have a very good adherence
- keep initial optical or mechanical Z levelling which provide very precise positionning.

thanks for answers

I do not know what firmware you are using, but will show you how I save my auto-bed leveling data in Marlin 1.1.X

Before Bed Leveling I use M502 to Restore Firmware Factory Reset - defaults.

After Auto Bed Leveling I use M500 to Save All EEProm settings

In Cura or whatever your default Slicer I simply restore Bed Leveling Data after Last Startup G-code
M420 S1

My Sample Startup G-Code
G21 ;metric values
G90 ;absolute positioning
M82 ;set extruder to absolute mode
M107 ;start with the fan off
G28 X0 Y0 ;move X/Y to min endstops
G28 Z0 ;move Z to min endstops
G1 Z15.0 F{travel_speed} ;move the platform down 15mm
;Put printing message on LCD screen
M117 My Print...
G28 X0 Y0
G1 E4.0 ;prime extruder
G92 E0 ;reset extruder length
M420 S1 ; Bed Leveling On

M420 Commands below
M420: Enable/Disable Bed Leveling and/or set the Z fade height.
S[bool] Turns leveling on or off
Z[height] Sets the Z fade height (0 or none to disable)
V[bool] Verbose - Print the leveling grid

I use Marlin (for megatronics v3.0) and slic3r optimized for PRUSA with repetier.

I'm going to test M420.

Thanks for your answer

.... Well

M420 S1 didn't seem to work the way I want...

I saw that it need to have MESH_BED_LEVELING set

But to archive Auto bed levelling, I need to keep AUTO_BED_LEVELING_FEATURE set

unfortunatly they can't be set together.

There's no M420 level correction with only MESH_BED_LEVELING or AUTO_BED_LEVELING_FEATURE

Edited 1 time(s). Last edit at 11/25/2017 05:26PM by B2V.

This is true, the M420 Z features do not work. I was happy just to save the bed leveling. An maybe one day the others will be added as well.

I started saving the Bed leveling data while using Linear bed leveling and now have changed to bi-linear bed leveling and sill saving the bed leveling data.
However I have to use the Menu "Store settings" or M500 from pronterface in Cura 15.04.6.


Video is a little jerky
[youtu.be]

Edited 2 time(s). Last edit at 11/25/2017 07:08PM by Roberts_Clif.

Thanks for your video... Beautiful printer , mine is build of pieces took here and there...


Anyway I finally succeed

First, I add a switch which can select either my optical endstop or my capacitive sensor.

I upgrade marlin to version 1.1.6 and enables AUTO_BED_LEVELING_UBL.

then I proccess this:

Switch to Capacitif sensor

M502          ; Reset settings to configuration defaults...
M500          ; Save to EEPROM
M501          ; Read back in the saved EEPROM.  

G28            ; Home XYZ.
G29 P1       ; Do automated probing of the bed.

G29 S1       ; Save UBL mesh points to EEPROM.
G29 A         ; Activate the UBL System.
M500          ; Save current setup.

Switch to optical end stop

after that I simply add g-code for all prints

G1 Z5 F4000; just to prevent any hurt
G28            ; Home XYZ.

Thats all I can now print using precise optical endstop and level correcting for best adherence