@fcwilt So yea i upgraded to 3.3 firmware today. I will remove m574 z1 s2 command. But can i use while homing z-probe and for safety endstop at the same time? should i make some g-code changes in home command?

Hi,
I have big problem with my original BLTouch Smart v3.1. The probe is randomly not trrigered while homing and my bed is crashing into nozzle. Offten this happens after completed print when i try to print something else in a row. But anyway, i want to add simple microswitch at the Z axis to prevent crashing bed against nozzle and i can't config it properly. Is it any possible way to have both "endstops" at the same time? I wired microswitch to the Zendstop on board and added M574 Z1 S1 P"zstop" after M574 Z1 S2. I'm using RRF 3.3

@Phaedrux Okay thanks i'll check it soon

@BjornH currently I'm using Heater3 pin from expansion port. In the past i tried heater 5 and got the same results In My previous printer i isolated Bltouch wires from any other cable and that made a job but i dont want to make two separate cable harnesses

Forgot about something else. When i'm making mesh bed leveling around 400 points (500x500mm bed) this problem never occur..

Hi,
So i have strange problem with my BLTouch (Smart V3.1). 90% of the time my bltouch is working correctly. But sometimes on homing from Home all button on web interface or homing before print from start g-code bltouch pin just slide inside body and entire bed is crashing into my nozzle. I tweaked some settings. Tried various speeds. Made another set of wires. Nothing helped. I'm using Duet 2 wifi on newest stable firmware 3.2.2 i believe. Printer is a coreXY based on RatRig V-core V2.

On checking z height and setting true 0 for nozzle i got readings around +/-0.08mm i think its pretty ok for this type of sensor?

; homeall.g
; called to home all axes
;
; generated by RepRapFirmware Configuration Tool v2.1.8 on Wed Apr 01 2020 22:00:59 GMT+0200 (czas środkowoeuropejski letni)
G91                     ; relative positioning
G1 H2 Z2.5 F200         ; lift Z relative to current position
G1 H1 X-495 Y-495 F3000 ; move quickly to X or Y endstop and stop there (first pass)
G1 H1 X-495             ; home X axis
G1 H1 Y-495             ; home Y axis
G1 X5 Y5 F600          ; go back a few mm
G1 H1 X-495 F360        ; move slowly to X axis endstop once more (second pass)
G1 H1 Y-495             ; then move slowly to Y axis endstop
G90                     ; absolute positioning
G1 X230 Y238 F3000     ; go to first bed probe point and home Z
M558 A1 F600			; Set single probing at faster feed rate 
G30                     ; home Z by probing the bed
M558 A3 F100 ; Set multi probing at slower feed rate
G30 ; Probe again to get a more accurate position

; Z-Probe
M950 S0 C"exp.heater3"                             ; create servo pin 0 for BLTouch
M558 P9 C"zprobe.in" H5	R0.2 F100 T4000 A5 B1 		;set Z probe type to bltouch and the dive height + speeds
G31 P25 X-3 Y-48.5 Z1.8	                      	 ; set Z probe trigger value, offset and trigger height
M557 X25:440 Y25:440 S20                            ; define mesh grid
M307 H3 A-1 C-1 D-1								   ; Unbind the Heater Pin

So guys i just dissasembled entire axis for gantry and assembled again. Tensioned belts a little bit less and got this.

I think problem is solved? Idk what caused this thing

@Phaedrux cube have perfect 20.00mm X and Y dimensions are 20.4mm

@Phaedrux entire gantry is running smoothly everywhere in range. I'll check the bearings thanks. And i got another problem. I left the printer for 2 days. Nothing changed and printed a new cube for a test.... I got an ugly uneven layered cube... It looks like stretched belts or something? 1587016723028726541296325768824.jpg

@mrehorstdmd Heat-break almost stuck in Titan aero and volcano block is very tight impossible to unscrew without tools. Entire gantry is very stiff but heavy bcs of titan aero