@fcwilt Ok i think i'll maybe do the Z home like this too.

Thanks you all for your patience and for your help

@dc42 Thanks everything works fine now

@fcwilt said in Why first move of tue bed leveling is going up?:

Now change the H2 parameter in the G31 command to H5.

I don't find where is this command with H2.

It's here?

;;;;;;;;;; BLTouch ;;;;;;;;;;
M950 S0 C"20.io0.out"                     ; Create a servo pin on io0 (toolboard 1LC)
M558 P9 C"20.io0.in" H5 F240 T10800 A5    ; set Z probe type to unmodulated and the dive height + speeds
G31 P25 X-28.00 Y-13.00 Z3.700          	  ; set Z probe trigger value, offset and trigger height, more Z means closer to the bed

But there is no H2 parameter in the G31 command.

@fcwilt Ok i think i'll maybe do the Z home like this too.

Thanks you all for your patience and for your help

@infiniteloop I did it. I split the G1 in two. The G1 command works fine.

But after that the G30 command moves the bed up again and fast close to the probe. And then the probing starts.

So if the bed is not leveled the bed will crash to the probe during this first fast move.

I don't want to add some mouvement before the bed moves up fast. I want it to not do that. It should probe directly not move up first.

Like it's done when you home your printer. When homing the Z i can start it from the bottom and the bed will slowly search the probe. It wil not move fast and then start to probe.

@fcwilt Ok so i homed all axis and then i take a video from what happened.

I started the video and just after i send the G32 command.

As you can see at first the bed moves up. I don't want that at all. I want the probe to go at his place first and then the bed can moves up.

link text

@fcwilt I already did it. And after this positioning command "G90 G1 X155 Y150 Z10" the bed did a fast move up while the bltouch is going to the first probe point then wait for the probe to be in the good place and finally did the probing work.

@fcwilt The paramater was already H5 so I tried H2 But no change. I set it back to H5.

@fcwilt said in Why first move of tue bed leveling is going up?:

Now change the H2 parameter in the G31 command to H5.

I don't find where is this command with H2.

It's here?

;;;;;;;;;; BLTouch ;;;;;;;;;;
M950 S0 C"20.io0.out"                     ; Create a servo pin on io0 (toolboard 1LC)
M558 P9 C"20.io0.in" H5 F240 T10800 A5    ; set Z probe type to unmodulated and the dive height + speeds
G31 P25 X-28.00 Y-13.00 Z3.700          	  ; set Z probe trigger value, offset and trigger height, more Z means closer to the bed

But there is no H2 parameter in the G31 command.

@infiniteloop Adding the line "G1 X5 Y10 Z20 F2000" before the G30 in the bed.g make my bed going down first. Then it goes up fast at the same time of the carriage moves in x/y to the first point.

So nothing really changed except i have a new mouvement before the problem occured.

@infiniteloop said in Why first move of tue bed leveling is going up?:

For one, you can increment the dive height.

I don't know how to do that. Can you tell me please.

@fcwilt said in Why first move of tue bed leveling is going up?:

In your homeall.g you have this:

G1 H2 Z5 F6000

Change the Z5 to Z10 and report back the behavior with this new setting.

With the bed is going more down when i home the z. But nothing changed with true bed leveling.

@infiniteloop @fcwilt I'm using a bltouch for z probe. I hommit to mention that after the bed moves up a little. The true bed leveling process continue and everything works fine. But because of that first move the probe is really close to the bed. And if the bed is not already horizontal the probe touches it and the process stops.

Here you can find my files :

config.g

;;;;;;;;;; General preferences ;;;;;
G90                                     ; Send absolute coordinates...
M83                                     ; ...but relative extruder moves
M550 P"V-Core 3"                        ; Set printer name
M669 K1                                 ; Set printer type as CoreXY
G29 S1                                  ; Set Units to Millimeters
G4 S1									; Wait for the expansion board to start
M404 N1.75 D0.4                         ; Filament width and nozzle diameter


;;;;;;;;;; Network ;;;;;;;;;;
M552 S1                                 ; enable WiFi
M586 P0 S1                              ; enable HTTP
M586 P1 S0                              ; disable FTP
M586 P2 S0                              ; disable Telnet


;;;;;;;;;; Drives ;;;;;;;;;;
M569 P0.0 S1 D3                         ; physical drive 0.0 goes forwards
M569 P0.1 S1 D3                         ; physical drive 0.1 goes forwards
M569 P0.2 S0 D3                         ; physical drive 0.2 goes forwards
M569 P0.3 S0 D3                         ; physical drive 0.3 goes forwards
M569 P0.4 S0 D3                         ; physical drive 0.4 goes forwards
M569 P20.0 S0 D3                        ; physical drive 0.5 goes forwards
M584 X0.0 Y0.1 Z0.2:0.3:0.4 E20.0.0     ; set drive mapping
M350 X16 Y16 Z16 E16 I1                 ; configure microstepping with interpolation

M92 X80.00 Y80.00 Z400.00               ; set steps per mm
M906 X1000 Y1000 Z800 I30               ; set motor currents (mA) and motor idle factor in per cent
M84 S30                                 ; Set idle timeout

M566 X400.00 Y400.00 Z6.00 E120.00 P1          ; set maximum instantaneous speed changes (mm/min)
M203 X10800.00 Y10800.00 Z1000.00 E3600.00     ; set maximum speeds (mm/min)
M201 X3000.00 Y3000.00 Z100.00 E3600.00        ; set accelerations (mm/s^2)


;;;;;;;;;; Axis Limits ;;;;;;;;;;
M208 X0 Y0 Z0 S1                               ; set axis minima
M208 X310 Y300 Z290 S0                         ; set axis maxima


;;;;;;;;;; Endstops ;;;;;;;;;;
M574 X1 S1 P"io1.in"                           ; configure active high endstops
M574 Y2 S1 P"io0.in"                           ; configure active high endstops
M574 Z1 S2                                     ; configure Z-probe endstop for low end on Z

M671 X-4.5:150:304.5 Y-4.52:305:-4.52 S5       ; define positions of Z leadscrews or bed levelling screws
M557 X20:280 Y20:280 P5                        ; define 5x5 mesh grid


;;;;;;;;;; Heaters ;;;;;;;;;;
M308 S0 P"temp0" Y"thermistor" T100000 B3950 A"Bed"    ; configure sensor 0 as thermistor on pin temp0
M950 H0 C"out0" T0                                     ; create bed heater output on out0 and map it to sensor 0
M307 H0 B0 S1.00                                       ; disable bang-bang mode for the bed heater and set PWM limit
M140 H0                                                ; map heated bed to heater 0
M143 H0 S110                                           ; set temperature limit for heater 0 to 110C
M307 H0 B0 R0.855 C274.9 D3.97 S1.00				   ; PID parameter

M308 S1 P"20.temp0" Y"PT1000" A"Hotend" 
M950 H1 C"20.out0" T1       ; create nozzle heater output on out0 and map it to sensor 1
M307 H1 B0 S1.00            ; disable bang-bang mode for heater and set PWM limit
M143 H1 S250                ; set the maximum temperature in C for heater
M307 H1 B0 R2.320 C237.4 D5.37 S1.00 V24.1


;;;;;;;;;; Fans ;;;;;;;;;;
M950 F0 C"20.out2+out2.tach" Q5000	; create fan 0 on pin out3 and set its frequency
M106 P0 C"Hotend Fan" S0 H1 T45		; set fan 0 name and value. Thermostatic control turned on for Hotend
M950 F1 C"20.out1" Q5000			; create fan 1 on pin out4 and set its frequency
M106 P1 C"Layer Fan" S0 H-1			; set fan 1 name and value. Thermostatic control is turned off


;;;;;;;;;; Tools ;;;;;;;;;;
M563 P0 D0 H1 F1           ; define tool 0
G10 P0 X0 Y0 Z0            ; set tool 0 axis offsets
G10 P0 R0 S0               ; set initial tool 0 active and standby temperatures to 0C


;;;;;;;;;; EVA 2 / BMG / Mosquitto ;;;;;;;;;;
M92 E830          ; set extruder steps per mm, 0.9 angle/step (LDO Pancake)
M906 E800         ; set extruder motor current (mA) and idle factor in per cent
 
 
;;;;;;;;;; BLTouch ;;;;;;;;;;
M950 S0 C"20.io0.out"                     ; Create a servo pin on io0 (toolboard 1LC)
M558 P9 C"20.io0.in" H5 F240 T10800 A5    ; set Z probe type to unmodulated and the dive height + speeds
G31 P25 X-28.00 Y-13.00 Z3.700          	  ; set Z probe trigger value, offset and trigger height, more Z means closer to the bed


;;;;;;;;;; Acclerometer ;;;;;;;;;;
;M955 P20.0 I10 ; specify orientation of accelerometer on Toolboard 1LC with CAN address 121


;;;;;;;;;; Pressure Advance ;;;;;;;;;;
M572 D0 S0.10

homeall.g

	M280 P0 S160        	; Precautionary alarm release (BLTouch)
	M280 P0 S90        		; Ensure the pin is raised (BLTouch)

	G91						; relative positioning
;	G1 H2 Z5 F6000			; lift Z relative to current position (bed goes down)
	G1 H1 X-999 Y999 F1800	; move quickly to X axis endstop and stop there (first pass)
	G1 H1 X-999 F1800		; move quickly to X axis endstop and stop there (first pass)
	G1 H1 Y999 F1800		; move quickly to Y axis endstop and stop there (first pass)
	G1 H0 X5 Y-5 F6000		; go back a few mm
	G1 H1 X-999 Y999 F100	; move quickly to X axis endstop and stop there (first pass)
	G1 H1 X-999 F100		; move quickly to X axis endstop and stop there (first pass)
	G1 H1 Y999 F100			; move quickly to Y axis endstop and stop there (first pass)
	
	G90               		; absolute positioning
	G1 X150 Y150 F10000		; go to first probe point
	G30               		; home Z by probing the bed

	G91              		; relative positioning
	G1 Z5 F1000       		; lift Z relative to current position  (bed goes down)
	G90              		; absolute positioning

deployprobe.g

; deployprobe.g
; Called to deploy a physical Z probe
;
M280 P0 S10															; Deploy the BLTouch pin

retractprobe.g

; retractprobe.g
; Called to retract a physical Z probe
;
M280 P0 S90													; Retract the BLTouch pin

@fcwilt But i'm printing and it works fine! What can be wrong in the configuration or wiring?

Hello,

When i execute a true bed leveling (G32) the bed goes up at the same time the carriage come to the first point. Then the bed wait for the carriage and finish to goes up.

The fact that the bed goes up at the same that the carriage moves had already caused me some crash from to the z probe to the bed.

The carriage should move first then the bed should goes up. Not both at the same time.

Is there a way to change that?

Here is my bed.g if that may help :

M561 ; clear any bed transform
	
G30 P0 X5 Y10 Z-99999		; probe near a leadscrew
G30 P1 X150 Y290 Z-99999	; probe near a leadscrew
G30 P2 X290 Y10 Z-99999 S3	; probe near a leadscrew and calibrate 3 motors

NB : The bed has three z motors.