BLtouch as min and endstop as max

briskspirit

Hi all.

So I have installed my BLtouch and wondering if it is possible to use my old Z max endstop just in case as a fail stop?

Thanks.

Phaedrux

If you mean relocating the Z max endstop to the Z min and using it as a backstop for a failed BLTouch probe, yes, you can. You would have to set the endstop as an emergency stop trigger.

https://duet3d.dozuki.com/Wiki/Connecting_an_Emergency_Stop

briskspirit

No, I meant leave it at Z max and use both. But never mind, thank you! You have answered my question )))

Phaedrux

Ah, I see what you mean. That can work as well. I do that myself. You would have to have seperate homing macros that would configure the endstop and do the homing or probing move.

Here's my hometoZmax macro as an example.

; HomeZMax.g
; Called to home Z to max endstop
M574 Z2 S1		; Set active-high switch (Opto) at the high end for Z Max.
G91				; Relative positioning
G1 S1 Z330 F300			; Move bed down until endstop triggers