No z-probe option crashes bed into nozzle
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Because the mount of my mini IR probe has become very slightly bent and does no longer trigger before the nozzle hits the bed I want to manually bring the nozzle to the bed and use a sheet of paper to get the offset for now.
On the wiki it says that if you use the no z-probe option (M558 P0) it will prompt me to bring the nozzle to the bed manually but this doesn't happen when I press the home Z button on the web interface or when starting a print, instead it will bring the bed up without stopping and then just crashes the bed into the nozzle until I press the emergency stop button.
Why do I not get prompted and what do I need to do to fix this?
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do you have a z endstop? also share the complete config to help diagnose.
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@Raven The easiest thing to do is simply keep nudging the bed towards the nozzle, then when it's just touching the paper enter G92 Z0.
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@bearer I do not have a z-endstop.
Here is my config.g:
; Configuration file for Duet WiFi (firmware version 2.03)
; executed by the firmware on start-up; General preferences
G90 ; send absolute coordinates...
M83 ; ...but relative extruder moves
M550 P"My Printer" ; set printer nameM667 S1 ; select CoreXY mode
; Network
M552 S1 ; enable network
M586 P0 S1 ; enable HTTP
M586 P1 S0 ; disable FTP
M586 P2 S0 ; disable Telnet; Drives
M569 P0 S1 ; physical drive 0 goes forwards
M569 P1 S1 ; physical drive 1 goes forwards
M569 P2 S1 ; physical drive 2 goes forwards
M569 P3 S0 ; physical drive 3 goes backwards
M584 X0 Y1 Z2:4 E3 ; set drive mapping
M350 X16 Y16 Z16 E16 I1 ; configure microstepping with interpolation
M92 X80.00 Y80.00 Z800.00 E420.00 ; set steps per mm
M566 X900.00 Y900.00 Z12.00 E120.00 ; set maximum instantaneous speed changes (mm/min)
M203 X6000.00 Y6000.00 Z180.00 E1200.00 ; set maximum speeds (mm/min)
M201 X500.00 Y500.00 Z20.00 E250.00 ; set accelerations (mm/s^2)
M906 X800 Y800 Z800 E800 I30 ; set motor currents (mA) and motor idle factor in per cent
M84 S30 ; Set idle timeout; Axis Limits
M208 X0 Y0 Z0 S1 ; set axis minima
M208 X230 Y210 Z200 S0 ; set axis maxima; Endstops
M574 X1 Y1 S1 ; set active high endstops
M574 Z1 S2 ; set endstops controlled by probe; Z-Probe
M558 P0
M557 X15:215 Y15:195 S20 ; define mesh grid; Heaters
M305 P0 T100000 B4138 R4700 ; set thermistor + ADC parameters for heater 0
M143 H0 S120 ; set temperature limit for heater 0 to 120C
M305 P1 T100000 B4138 R4700 ; set thermistor + ADC parameters for heater 1
M143 H1 S280 ; set temperature limit for heater 1 to 280C; Fans
M106 P0 S0 I0 F500 H-1 ; set fan 0 value, PWM signal inversion and frequency. Thermostatic control is turned off
M106 P1 S1 I0 F500 H1 T45 ; set fan 1 value, PWM signal inversion and frequency. Thermostatic control is turned on; Tools
M563 P0 D0 H1 F0 ; 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 -
@deckingman How do I do this using the duet wifi web interface?
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@Raven said in No z-probe option crashes bed into nozzle:
@deckingman How do I do this using the duet wifi web interface?
Use the Z minus buttons - the line of buttons to the right of Home Z.
Edit - if you go too far, use the Z plus buttons to jog in the other direction
You might need to use M564 H0 to allow movement.
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@deckingman Thank you for the information!
But I still have the problem that the bed goes automatically up when I home Z. This shouldn't happen but I can't figure out why it does this. Would you have any idea what causes this? -
@Raven If you don't have a switch or a probe or any other means of detecting when the nozzle and bed are close together, then you can't home Z other than manually doing it using G92 as I described.
Homez will run whatever commands are in the your homez macro. If you used to homez with the IR probe, but now that IR probe doesn't trigger because it's slightly bent, then don't use that homez macro.
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@Raven said in No z-probe option crashes bed into nozzle:
Because the mount of my mini IR probe has become very slightly bent and does no longer trigger before the nozzle hits the bed I want to manually bring the nozzle to the bed and use a sheet of paper to get the offset for now.
On the wiki it says that if you use the no z-probe option (M558 P0) it will prompt me to bring the nozzle to the bed manually but this doesn't happen when I press the home Z button on the web interface or when starting a print, instead it will bring the bed up without stopping and then just crashes the bed into the nozzle until I press the emergency stop button.
Why do I not get prompted and what do I need to do to fix this?
It's probably because your homez.g file or the Z homing section of homeall.g is incorrect. It should use a G30.command to probe the bed, not a G1 H1 Z command. See https://duet3d.dozuki.com/Wiki/ConfiguringRepRapFirmwareCartesianPrinter#Section_Homing_Z_using_a_Z_probe.
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Thank you for your reply,
The problem turned out to be the "M574 Z1 S2" command. When removed the bed would no longer raise automatically.I still do have another problem.
When manually setting the offset of the Z-axis I set the the Z-axis value at 0 when I probed it manually using some paper but once I start a print it will start to print 2 to 3 cm in the air. Why is that? Where does this offset come from and where would I change this? -
You need to post your homeall.g so we can see what's going on when you home the printer.
