Is this normal
luckyflyer last edited by luckyflyer
I have followed the calibrate the Z probe trigger height documentation (have done it several times, the paper is very tight between nozzle and bed) and ran G29. I start a print but the nozzle is .7 mm too high. I compensate for it in s3d with a -.7 Z offset, first layer is now ideal. Is this how others do this or am I missing or not doing something right?
I just now noticed the last line of my config.G , I know I put it there but can't remember why, I've commented it out for now.
; Configuration file for Duet 3 (firmware version 3) ; executed by the firmware on start-up ; ; generated by RepRapFirmware Configuration Tool v2.1.8 on Wed Apr 29 2020 12:52:20 GMT-0600 (Mountain Daylight Time) ; General preferences G90 ; send absolute coordinates... M83 ; ...but relative extruder moves M550 P"Duet 3" ; set printer name M669 K1 ; select CoreXY mode ; Drives M569 P0.0 S1 ; physical drive 0.0 goes forwards M569 P0.1 S1 ; physical drive 0.1 goes forwards M569 P0.2 S0 ; physical drive 0.2 goes backwards M569 P0.3 S0 ; physical drive 0.3 goes backwards M584 X0.1 Y0.0 Z0.2 E0.3 ; set drive mapping Y = drive 0 X = drive 1 Z = drive 2 Extruder drive 3 M350 X16 Y16 Z16 E16 I1 ; configure microstepping with interpolation M92 X200.00 Y200.00 Z1600.00 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 E1000 I30 ; set motor currents (mA) and motor idle factor in per cent M84 S30 ; Set idle timeout ; Axis Limits M208 X0 Y0 Z-3 S1 ; set axis minima M208 X300 Y300 Z300 ; set axis maxima ; Endstops M574 X1 S1 P"!io1.in" ; configure for low end, active-low endstop on X via pin io1.in M574 Y2 S1 P"!io2.in" ; configure for high end, active-low endstop on Y via pin io2.in M574 Z1 S1 P"!io3.in" ; configure for low end, active-low endstop on Z via pin io3.in ; Z-Probe M950 S0 C"io4.out" ; create a gpio servo pin 0 for BLTouch M558 P9 C"io4.in" H3 F120 R.350 T6000 ; set Z probe type to bltouch, set input to io 4 in, set dive height + speeds G31 P500 X0 Y0 Z3.96 ; set Z probe trigger Height, X and Y offset and trigger height M557 X15:295 Y0:242 P6:6 ; define mesh grid ; Heaters M308 S0 P"temp0" Y"thermistor" T100000 B4138 ; 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 M143 H0 S110 ; set temperature limit for heater 0 to 110C M307 H0 A236.8 C516.8 D3.0 V24.1 B0 ; disable bang-bang mode for the bed heater and set PWM limit M140 H0 ; map heated bed to heater 0 M308 S1 P"temp1" Y"thermistor" T100000 B4138 ; configure sensor 1 as thermistor on pin temp1 M950 H1 C"out1" T1 ; create nozzle heater output on out1 and map it to sensor 1 M143 H1 S260 ; set temperature limit for heater 1 to 260C M307 H1 A445.5 C173.0 D5.5 V24.1 B0 ; disable bang-bang mode for hotend heater and set PWM limit ; Fans M950 F0 C"out7" Q500 ; create fan 0 on pin out7 and set its frequency M106 P0 S0 H-1 ; set fan 0 value. Thermostatic control is turned off M950 F1 C"out8" Q500 ; create fan 1 on pin out8 and set its frequency M106 P1 S1 H1 T45 ; set fan 1 value. Thermostatic control is turned on ; Tools M563 P0 S"E3D-V6" 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 ; Lights M950 P1 C"out3" ; Create port on out 3 to power lights, 12v lights are wired in series ; Bed leveling M671 X-8.0:175.0:320.0 Y-11.0:320.0:-11.0 ; Define position of bed leveling screws ; Custom settings are not defined ; Miscellaneous T0 ; select first tool ;G10 P0 2.45 ; Set tool offset
; homeall.g ; called to home all axes ; ; generated by RepRapFirmware Configuration Tool v2.1.8 on Wed Apr 29 2020 12:52:20 GMT-0600 (Mountain Daylight Time) G91 ; relative positioning G1 H2 Z7 F6000 ; lower bed 7mm to ensure probe is above the Z probe trigger height G1 H1 X-310 Y310 F2600 ; move quickly to X or Y endstop and stop there (first pass) G1 H1 X-310 ; home X axis G1 H1 Y310 ; home Y axis G1 X5 Y-5 F6000 ; go back a few mm X and Y G1 H1 X-310 F360 ; move slowly to X axis endstop once more (second pass) G1 H1 Y310 F360 ; then move slowly to Y axis endstop G90 ; absolute positioning G1 X150 Y90 F2000 ; Move probe over to the centre of the bed G30 ; lower probe, stop when probe triggered and set Z to trigger height, home Z by probing the bed ; Uncomment the following lines to lift Z after probing ;G91 ; relative positioning ;G1 Z5 F100 ; lift Z relative to current position ;G90 ; absolute positioning
G31 P500 X0 Y0 Z3.96
Part of the problem could be that you don't have an X Y offset for the BlTouch. This will mean that the height map isn't accurate for where the nozzle actually is.
4mm seems pretty high for a trigger height for the BLTouch as well. When it's mounted as described in the BLTouch documentation the base of the probe should be ~8mm above the nozzle tip, which should give ~2mm trigger height, which is the sweet spot for it's reliability.