I am having a real hard time level my bed
TimsWorkshop last edited by TimsWorkshop
I know, I know.. this question! I feel like a right n00b for asking this, but I can't seem to figure out how to get my bed to keep my z-offset and level correctly.
I have a Ender 5 Plus with an EZABL Pro Sensor for levelling. I have setup my sensor and calibrated as instructed by TH3D and the sensor sits evenly on the wrench.
I can see that my z-offset is -3.40 and when I set this in my config.g file, as seem below:
G31 P500 X0 Y0 Z-3.40
But when I re-home the nozzle is way off the previous setting.
I read that I need to update homeall.g and homez.g, but not sure what command I need to use to get my z-offset to stick.
Is there a bed levelling for dummies link which I can follow on how to level my RepRap printer with a EZABLE sensor?
Again, apologies for the dumb question, but I feel like a dummy right now.
In case you ask, here's my config.g file
; Configuration file for Duet WiFi (firmware version 3) ; executed by the firmware on start-up ; ; generated by RepRapFirmware Configuration Tool v3.3.0 on Sun Aug 08 2021 21:27:12 GMT+1000 (Australian Eastern Standard Time) ; General preferences G90 ; send absolute coordinates... M83 ; ...but relative extruder moves M550 P"Oneill" ; 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 S1 ; physical drive 0 goes forwards M569 P1 S1 ; physical drive 1 goes forwards M569 P2 S1 ; physical drive 2 goes forwards M569 P3 S1 ; physical drive 3 goes forwards M584 X0 Y1 Z2 E3 ; set drive mapping M350 X16 Y16 Z16 E16 I1 ; configure microstepping with interpolation M92 X80.00 Y80.00 Z400.00 E420.00 ; set steps per mm M566 X900.00 Y900.00 Z300.00 E2000.00 ; set maximum instantaneous speed changes (mm/min) M203 X6000.00 Y6000.00 Z600.00 E6000.00 ; set maximum speeds (mm/min) M201 X500.00 Y500.00 Z200.00 E3000.00 ; 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 Z-10 S1 ; set axis minima M208 X350 Y350 Z400 S0 ; set axis maxima ; Endstops M574 X1 S1 P"xstop" ; configure active-high endstop for low end on X via pin xstop M574 Y1 S1 P"ystop" ; configure active-high endstop for low end on Y via pin ystop M574 Z1 S2 ; configure Z-probe endstop for low end on Z ; Z-Probe ;M558 P1 C"zprobe.in" H5 F120 T6000 ; set Z probe type to unmodulated and the dive height + speeds M558 P5 C"!zprobe.in" H3 F900 T12000 G31 P500 X0 Y0 Z-3.40 ; set Z probe trigger value, offset and trigger height M557 X15:320 Y15:335 S50 ; define mesh grid ; Heaters M308 S0 P"bedtemp" Y"thermistor" T100000 B4138 ; configure sensor 0 as thermistor on pin bedtemp M950 H0 C"bedheat" T0 ; create bed heater output on bedheat 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 S120 ; set temperature limit for heater 0 to 120C M308 S1 P"e0temp" Y"thermistor" T100000 B4138 ; configure sensor 1 as thermistor on pin e0temp M950 H1 C"e0heat" T1 ; create nozzle heater output on e0heat and map it to sensor 1 M307 H1 B0 S1.00 ; disable bang-bang mode for heater and set PWM limit M143 H1 S280 ; set temperature limit for heater 1 to 280C ; Fans M950 F0 C"fan0" Q500 ; create fan 0 on pin fan0 and set its frequency M106 P0 S0 H-1 ; set fan 0 value. Thermostatic control is turned off M950 F1 C"fan1" Q500 ; create fan 1 on pin fan1 and set its frequency M106 P1 S1 H1 T45 ; set fan 1 value. 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 ; Custom settings are not defined ; Filament Runout Sensor M591 D0 P1 C"e0stop" S1 ; TFT Display Config M575 P1 S1 B57600 ; Miscellaneous M501 ; load saved parameters from non-volatile memory M911 S10 R11 P"M913 X0 Y0 G91 M83 G1 Z3 E-5 F1000" ; set voltage thresholds and actions to run on power loss
And here's my homeall.g file
; homeall.g ; called to home all axes ; ; generated by RepRapFirmware Configuration Tool v3.3.0 on Sun Aug 08 2021 21:27:12 GMT+1000 (Australian Eastern Standard Time) G91 ; relative positioning G1 H2 Z5 F6000 ; lift Z relative to current position G1 H1 X-355 Y-355 F6000 ; 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-355 Y-355 F1800 ; move slowly to X and Y axis endstops once more (second pass) G90 ; absolute positioning G1 X175 Y175 F6000 ; go to first bed probe point and home Z M558 F900 ; Home EZABL Fast 15mm/s G30 ; home Z by probing the bed M558 F450 ; Home EZABL Slow 7.5mm/s G30 ; home Z by probing the bed
And my homez.g file
; generated by RepRapFirmware Configuration Tool v3.3.0 on Sun Aug 08 2021 21:27:13 GMT+1000 (Australian Eastern Standard Time) G91 ; relative positioning G1 H2 Z5 F6000 ; lift Z relative to current position G90 ; absolute positioning G1 X175 Y175 F6000 ; go to first probe point G30 ; home Z by probing the bed
Having a Z probe Trigger Height setting in G31 of -3.40 says that the probe triggers when it is below the nozzle - how is that possible?
@fcwilt Ok.. so I'm setting the wrong spot for the z-offset...
@infidelprops said in I am having a real hard time level my bed:
@fcwilt Ok.. so I'm setting the wrong spot for the z-offset...
From the G31 documentation (abbreviated some):
G31: Set or Report Current Probe status
G31 Pnnn Xnnn Ynnn Znnn
Pnnn Trigger value
Xnnn Probe X offset1
Ynnn Probe Y offset1
Znnn Trigger Z height
Notice there is no parameter named Z offset - so we are talking about the Trigger Z Height parameter - correct?
@fcwilt Yeah, looks like I'm trying to set the z-offset in the wrong spot which then makes me ask, where do I set the correct z-offset?
@fcwilt oohh... sorry. When I level my bed and configure it as per the EZABL setting, it's all good.
But when I go to print, the nozzle is roughly 4-5 mm above the bed and I babystep down to set the offset... and once I get that offset number, I want to set that somewhere like I do on Marlin printers.
Sorry for all the confusion!
engikeneer last edited by engikeneer
@infidelprops the 'set z offset like Marlin' is what you are doing when you set the G31 Z trigger height. You are telling the printer that when the z probe tiggers during a G30 probing move, set the Z height to xx value.
In your case, you were setting it to -3.40mm. I.e. when the probe tiggers the nozzle is 3.4mm below the bed surface which is mostly likely wrong. You just need to work out what the correct number to put in the G31 Z in your config (I'm guessing it'll be about 1.5mm)
Edit: this part of the z probe guide should tell you how to correctly determine what your z trigger height should be:
@engikeneer Great, thanks for the link! I will check it out now as I drink my morning
@engikeneer Thanks mate, after a coffee and a clear head, that did link did help me. I feel dumb as I saw that previously, but thought it was only for BLTouch calibratin.