BLTouch driving me mad please help

[AndyB]

Hi,You have to put the Gcode "G29" in the start section of your slicer. I use Cura and this is what is in my Start G-code section:

M117 Heating Bed.
M140 S{material_bed_temperature_layer_0} ; Set Heat Bed temperature
M190 S{material_bed_temperature_layer_0} ; Wait for Heat Bed temperature
M117 Pre-heat extruder to 160.
M104 S160; start warming extruder to 160
G28 ; Home all axis.
M117 Auto bed-leveling.
G29 ; Auto bed-level (BL-Touch)
G1 X0 ; Move to side of bed.
G92 E0 ; Reset Extruder
M117 Heat extruder up to full temp.
M104 S{material_print_temperature_layer_0} ; Set Extruder temperature
M109 S{material_print_temperature_layer_0} ; Wait for Extruder temperature
G1 Z1.0 F3000 ; move z up little to prevent scratching of surface
G1 X0.1 Y20 Z0.3 F5000.0 ; move to start-line position
M117 Purge the extruder.
G1 X0.3 Y200.0 Z0.3 F1500.0 E15 ; draw 1st line
G1 X0.6 Y200.0 Z0.3 F5000.0 ; move to side a little
G1 X0.6 Y20 Z0.3 F1500.0 E30 ; draw 2nd line
G92 E0 ; reset extruderG1 Z1.0 F3000 ; move z up little to prevent scratching of surface
M117 Printing model.Hope this helps you.
Cheers,Andy

PS the M117 code just sends a message to the LCD screen.

[Roberts_Clif]

Wow now that start up G-Code was quite a feat.

My G-Code looks like this

;Filament used: {filament_amount}m {filament_weight}g
;Filament cost: {filament_cost}
;M190 S{print_bed_temperature} ;Uncomment to add your own bed temperature line
;M109 S{print_temperature} ;Uncomment to add your own temperature line
G21        ;metric values
G90        ;absolute positioning
M82        ;set extruder to absolute mode
;M106 S127 ;set Fan half speed
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
M220 S32.000000
;M420 V1   ; Print the leveling grid

The following line takes care of restoring bed leveling data. " M420 - Bed Leveling State "

This now is not necessary in newer version of firmware as this line takes care of it. " #define RESTORE_LEVELING_AFTER_G28 "