BL Touch Query

900turbo

Currently working my way through setting up and commissioning my printer. My 3 Z endstops are optical flags however due to a new extruder. I do not think I can run them due to dimensional differences. Can I use my BL touch as the Z endstop whilst retaining its bed levelling features after it has performed homing ?
Any help with this would be greatly appreciated.
Thank You.

droftarts

@900turbo Yes, that should be fine, you just need to change your homing files to use the Z probe rather than the endstops.

NOTE: I spotted an error in your config.g or homing file, see your other thread to fix motor direction and/or endstop position first. https://forum.duet3d.com/post/314077

Assuming the X and Y endstop position is correct, and using your current homeall.g from your other thread, change it to the following:

; homeall.g
; called to home all axes
;
; generated by RepRapFirmware Configuration Tool v3.3.16 on Mon Apr 17 2023 13:03:57 GMT+0100 (British Summer Time)
G91                    ; relative positioning
G1 H2 Z5 F6000         ; lift Z relative to current position
G1 H1 X-705 Y705 F1800 ; move quickly to X or Y endstop and stop there (first pass)
G1 H1 X-705            ; home X axis
G1 H1 Y705             ; home Y axis
G1 X5 Y-5 F6000        ; go back a few mm
G1 H1 X-705 F360       ; move slowly to X axis endstop once more (second pass)
G1 H1 Y705             ; then move slowly to Y axis endstop

G90                     ; absolute positioning
G1 X350 Y350 F6000      ; go to bed center
G30                     ; home Z by probing the bed

If this leaves the nozzle on the bed after probing (probably not if using a BLTouch), you can add the following after to lift it:

G91                    ; relative positioning
G1 Z5 F100             ; lift Z relative to current position
G90                    ; absolute positioning

Ian