Nozzle crashes during print start or stops too high

Phaedrux

Can you post your homeall file?

bellus

; homeall.g
; called to home all axes
;
; generated by RepRapFirmware Configuration Tool v2 on Tue Feb 05 2019 20:31:22 GMT-0700 (MST)
G91 ; relative positioning
G1 Z5 F2400 S2 ; lift Z relative to current position
M98 Pdeployprobe.g ; deploy mechanical Z probe
G1 S1 X-245 Y-225 F1800 ; move quickly to X and Y axis endstops and stop there (first pass)
G1 X5 Y5 F2400 ; go back a few mm
G1 S1 X-245 Y-225 F360 ; move slowly to X and Y axis endstops once more (second pass)
G90 ; absolute positioning
G1 X15 Y15 F2400 ; go to first bed probe point and home Z
G30 ; home Z by probing the bed

; Uncomment the following lines to lift Z after probing
;G91 ; relative positioning
;G1 S2 Z5 F40 ; lift Z relative to current position
;G90 ; absolute positioning

M98 Pretractprobe.g ; retract mechanical Z probe

Phaedrux

@bellus said in Nozzle crashes during print start or stops too high:

M98 Pdeployprobe.g ; deploy mechanical Z probe
M98 Pretractprobe.g ; retract mechanical Z probe

Remove those from your homeall. The G30 command will deploy and retract as needed. This could be causing your issue.

bellus

![alt text](image url)@phaedrux said in Nozzle crashes during print start or stops too high:

@bellus said in Nozzle crashes during print start or stops too high:

M98 Pdeployprobe.g ; deploy mechanical Z probe
M98 Pretractprobe.g ; retract mechanical Z probe

Remove those from your homeall. The G30 command will deploy and retract as needed. This could be causing your issue.

Removed as suggested, no change. The only thing that seems to help is to Z offset. Running the calibration of the probe I would religiously get right around 2mm. I changed it to .75mm and it wasn’t as bad.

bellus

Here’s a quick video https://youtu.be/Jux1Wyts-B0

bellus

@bellus

At 0 even it’s not crashing and actually attempting to print. Nozzles about .5mm to high.

Phaedrux

@bellus said in Nozzle crashes during print start or stops too high:

Here’s a quick video https://youtu.be/Jux1Wyts-B0

So what command was running in that video? It probed once and then dropped the nozzle into the bed. Was that G28? G29? G30? G32?

bellus

@phaedrux

It’s the G28 command, when it starts a print, probes once, then nose dives. I was actually able to get past that point by changing the Z offset to 0, but like I said it’s a bit high(roughly 1mm). I re-measured the Bl touch base from the nozzle tip, it’s almost exactly 8mms.

Phaedrux

Can you post the contents of your config-override.g file?

bellus

@phaedrux

As requested,

; This is a system-generated file - do not edit
; Heater model parameters
M307 H0 A66.5 C483.4 D6.2 S1.00 V12.1 B0
M307 H1 A680.2 C325.1 D11.5 S1.00 V12.0 B0
M307 H2 A633.9 C320.4 D13.3 S1.00 V12.0 B0
M307 H4 A340.0 C140.0 D5.5 S1.00 V0.0 B0
M307 H5 A340.0 C140.0 D5.5 S1.00 V0.0 B0
M307 H6 A340.0 C140.0 D5.5 S1.00 V0.0 B0
M307 H7 A340.0 C140.0 D5.5 S1.00 V0.0 B0

I also was to able to set the trigger height to 0.500 with positive results. It’s printing, albeit a blobby mess, just needs a bit of tuning. Honestly don’t know why the trigger height is so low compared the calibration steps, but it’s working.

; Drives
M569 P0 S1 ; Drive 0 goes forwards
M569 P1 S1 ; Drive 1 goes forwards
M569 P2 S1 ; Drive 2 goes forwards
M569 P3 S1 ; Drive 3 goes forwards
M569 P4 S1 ; Drive 4 goes forwards
M350 X16 Y16 Z16 E16:16 I0 ; Configure microstepping without interpolation
M92 X79.86. Y79.86 Z400.0 E390.12:390.12. ; Set steps per mm
M566 X2000.00 Y2000.00 Z50.00 E120.00:120.00 ; Set maximum instantaneous speed changes (mm/min)
M203 X6000.00 Y6000.00 Z100.00 E200.00:200.00 ; Set maximum speeds (mm/min)
M201 X500.00 Y500.00 Z60.00 E100.00:100.00 ; Set accelerations (mm/s^2)
M906 X1100.00 Y1100.00 Z1600.00 E1000.00:1000.00 I30 ; Set motor currents (mA) and motor idle factor in per cent
M84 S30 ; Set idle timeout

; Axis Limits
M208 X-130 Y-110 Z0 S1 ; Set axis minima
M208 X130 Y110 Z300 S0 ; Set axis maxima

; Endstops
M574 X1 Y1 S1 ; Set active high endstops

; Z-Probe
M574 Z1 S2 ; Set endstops controlled by probe
M307 H3 A-1 C-1 D-1 ; Disable heater on PWM channel for BLTouch
M558 P9 H5 F120 T2400 ; Set Z probe type to bltouch and the dive height + speeds
G31 P25 X0 Y0 Z0.5000 ; Set Z probe trigger value, offset and trigger height
M557 X15:220 Y15:210 S15 ; Define mesh grid

; Heaters
M305 P0 T100000 B4138 R4700 ; Set thermistor + ADC parameters for heater 0
M143 H0 S110 ; Set temperature limit for heater 0 to 110C
M305 P1 T100000 B4138 R4700 ; Set thermistor + ADC parameters for heater 1
M143 H1 S250 ; Set temperature limit for heater 1 to 250C
M305 P2 T100000 B4138 R4700 ; Set thermistor + ADC parameters for heater 2
M143 H2 S250 ; Set temperature limit for heater 2 to 250C

; Fans
M106 P0 S1 I0 F500 H1 T180 ; Set fan 0 value, PWM signal inversion and frequency. Thermostatic control is turned on
M106 P1 S1 I0 F500 H2 T180 ; Set fan 1 value, PWM signal inversion and frequency. Thermostatic control is turned on

; Tools
M563 P0 S"Right" D0 H1 ; 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
M563 P1 S"Left" D1 H2 ; Define tool 1
G10 P1 X16 Y0 Z0 ; Set tool 1 axis offsets
G10 P1 R0 S0 ; Set initial tool 1 active and standby temperatures to 0C

; Automatic power saving
M911 S10 R11 P"M913 X0 Y0 G91 M83 G1 Z3 E-5 F1000" ; Set voltage thresholds and actions to run on power loss

; Custom settings are not configured

; Miscellaneous
M501 ; Load saved parameters from non-volatile memory
T0 ; Select first tool