z probe offest
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i have a gmax 1.5xt running a duet 2 wifi and a titan aero and bl touch
I have everything setup and working machine homes fine but everytime i start a print it prints in the air maybe 2mm off the bed no amount of z babystep or offset changes make a difference. hopefully someone can point me in the correct direction as i am new to rep rap and duet. thanks in advance below are my config and home files.; Configuration file for Duet WiFi (firmware version 2.03)
; executed by the firmware on start-up
;
; generated by RepRapFirmware Configuration Tool v3.2.3 on Sat Mar 13 2021 08:44:46 GMT-0500 (Eastern Standard Time); General preferences
G90 ; send absolute coordinates...
M83 ; ...but relative extruder moves
M550 P"My Printer" ; set printer name; Network
M552 S1 ; enable network
M586 P0 S1 ; enable HTTP
M586 P1 S0 ; disable FTP
M586 P2 S0 ; disable Telnet; Drives
M569 P0 S0 ; physical drive 0 goes backwards
M569 P1 S1 ; physical drive 1 goes forwards
M569 P2 S1 ; physical drive 2 goes forwards
M569 P3 S0 ; physical drive 3 goes backwards
M569 P4 S0 ; physical drive 4 goes backwards
M584 X0 Y1 Z2 E3:4 ; set drive mapping
M350 X16 Y16 Z16 E16:16 I1 ; configure microstepping with interpolation
M92 X80.00 Y80.00 Z400.00 E837.00:837.00 ; set steps per mm
M566 X900.00 Y900.00 Z60.00 E120.00:120.00 ; set maximum instantaneous speed changes (mm/min)
M203 X6000.00 Y6000.00 Z180.00 E1200.00:1200.00 ; set maximum speeds (mm/min)
M201 X500.00 Y500.00 Z20.00 E250.00:250.00 ; set accelerations (mm/s^2)
M906 X800 Y800 Z800 E800:800 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 X400 Y405 Z530 S0 ; set axis maxima; Endstops
M574 X1 Y1 S1 ; set active high endstops
M574 Z1 S2 ; set endstops controlled by probe; Z-Probe
M307 H3 A-1 C-1 D-1 ; disable heater on PWM channel for BLTouch
M558 P9 H5 F120 T6000 ; set Z probe type to bltouch and the dive height + speeds
G31 P500 X25 Y25 Z-.5 ; set Z probe trigger value, offset and trigger height
M557 X15:215 Y15:195 S20 ; define mesh grid; Heaters
M307 H0 B0 S1.00 ; disable bang-bang mode for the bed heater and set PWM limit
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 X2 ; set thermistor + ADC parameters for heater 1 and remap it to channel 2
M143 H1 S280 ; set temperature limit for heater 1 to 280C
M305 P2 T100000 B4138 R4700 ; set thermistor + ADC parameters for heater 2
M143 H2 S280 ; set temperature limit for heater 2 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 H1:2 T45 ; set fan 1 value, PWM signal inversion and frequency. Thermostatic control is turned on; Tools
M563 P1 D0:1 H2:1 F0 ; define tool 1
G10 P1 X0 Y0 Z0 ; set tool 1 axis offsets
G10 P1 R0 S0 ; set initial tool 1 active and standby temperatures to 0C
M568 P1 S1 ; enable mixing for tool 1
M567 P1 E0.5:0.5 ; set mixing ratios for tool 1; Custom settings are not defined
; Miscellaneous
M575 P1 S1 B57600 ; enable support for PanelDuehomeall.g
; called to home all axes
;
; generated by RepRapFirmware Configuration Tool v3.2.3 on Sat Mar 13 2021 08:44:46 GMT-0500 (Eastern Standard Time)
G91 ; relative positioning
G1 H2 Z5 F6000 ; lift Z relative to current position
G1 H1 X-405 Y-410 F1800 ; move quickly to X and Y axis endstops and stop there (first pass)
G1 H2 X5 Y5 F6000 ; go back a few mm
G1 H1 X-405 Y-410 F360 ; move slowly to X and Y axis endstops once more (second pass)
G90 ; absolute positioning
G1 X150 Y150 ; move probe to center
G30 ; home Z by probing the bed
G1 X0 Y0 ; move back to home position; Uncomment the following lines to lift Z after probing
;G91 ; relative positioning
;G1 Z5 F100 ; lift Z relative to current position
;G90 ; absolute positioning -
@way2lo2 You have a negative offset for the Z in G31.
For example I have this for G31:
G31 P500 X0 Y-60 Z1.98 ; Set Z probe trigger value, offset and trigger height; increase to get closer -
@Stephen6309 thanks that did that was it. is there a reason the z babystep would not make changes before?
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@way2lo2 Not sure, but I do know the firmware won't go below Z0, if you have your M208 set Z minimum to 0.
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I would try ...reset your G92 Z0.... bring the tip to a piece of paper enter your G92 Z0 then enter
Now your machien knows wher the glass is
Step 2...
The follow the document tab on this web page to calibrate the z prob. The step by steps are in the setup portion of the documetation portion of this site
I beleive your issue is your printer still has the old head hieght saved under the code above.
Click on the three bars to finf documwntation tab
Good luck
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One G92 Z0 was entered it set a limit to how far it will descend to over ride that look at the comants in calibrating z probe... ill go look what the comand is to override the previous setting so you can bring tip to paper to be able to set your stop hieght
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M564 S0. ENTER will disable the limits and allow you to set your G92 S0. Then your machine will know wher the glas is
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After that you still need to calibrate your z prob
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@Stephen6309 said in z probe offest:
@way2lo2 Not sure, but I do know the firmware won't go below Z0, if you have your M208 set Z minimum to 0.
That's right. So on the first layer the most you can baby step down by is the first layer height.
For best results the probe trigger height must be accurate. Set it at the same point you use for homing. And use that same point for setting Z0 before generating a heightmap or after doing tilt correction.
If you do need to baby step down consistently you can use the amount used to modify the G31 trigger height to make it permanent.
Setting the M208 Z minima to -0.5 would let you go a bit lower, but use that with caution.
