Z offset is .030 too high after starting print?
-
you can define a z offset using M206
https://duet3d.dozuki.com/Wiki/Gcode#Section_M206_Offset_axes
if you dont have a probe.however i would highly recommend a probe unless your bed is perfectly flat
also your thermistor settings are wrong B4138 is the default, and wrong for your thermistors.
M305 P0 T100000 B4138 R4700 ; set thermistor + ADC parameters for heater 0
M305 P1 T100000 B4138 R4700 ; set thermistor + ADC parameters for heater 1
M305 P2 T100000 B4138 R4700 ; set thermistor + ADC parameters for heater 2 -
Thanks, I didn't realize the thermistors were wrong, I will fix that.
I was trying to set up a BLTouch earlier but I had so many issues with it... So I gave up and went back to the endstop setup.I ran M206 and it came back with Axis offsets: X0.00 Y0.00 Z0.00
I guess I can just set -.030? still not sure where it's getting that offset from. -
I just tried M206 X0 Y0 Z-0.030 and then started a print, the offset is still +.030... any other ideas? I'm stumped.
-
@TheBasedDoge said in Z offset is .030 too high after starting print?:
M208 X0 Y0 Z0 S1 ; set axis minima
i think you will need to allow negative movement.
try
M208 X0 Y0 Z-1 S1 ; set axis minimawhat was your problem with the bltouch?
-
What do you have in homeall?
If you're not using a probe, how are you homing the Z axis?
-
Ok thanks, i'll try this after the current print finishes.
The BLTouch wasn't reliably deploying and retracting.... I had two times where it woudn't deploy and the bed smacked into the hotend and cracked the glass
Then I had an issue where the probe fell out of the housing, i took it apart and saw that it was just held up by a piece of heat-shrink or something. I don't know if i have a defective one or an old one or something but it's just giving me too many issues.here is my homeall.g. All the BLTouch stuff is commented out now. I went back to just a regular endstop
; homeall.g
; called to home all axes
;
; generated by RepRapFirmware Configuration Tool v2.1.4 on Tue Dec 17 2019 00:47:58 GMT-0500 (Eastern Standard Time)
;G91 ; relative positioning
;G1 H2 Z2 F7200 ; lift Z relative to current position
;G1 H1 X-305 Y-305 F3300 ; move quickly to X or Y endstop and stop there (first pass)
;G1 H1 X-305 ; home X axis
;G1 H1 Y-305 ; home Y axis
;G1 X10 Y10 F7200 ; go back a few mm
;G1 H1 X-305 F300 ; move slowly to X axis endstop once more (second pass)
;G1 H1 Y-305 ; then move slowly to Y axis endstop
;G90 ; absolute positioning
;G1 H2 X-5 Y10 F7200 ; go to first bed probe point and home Z
;G1 H1 X-305 ; home X axis
;G1 H1 Y-305 ; home Y axis
;G30 ; home Z by probing the bedG91 ; relative positioning
G1 H2 Z5 F9000 ; lift Z relative to current position
G1 H1 X-305 Y-305 F3600 ; move quickly to X and Y axis endstops and stop there (first pass)
G1 H2 X5 Y5 F9000 ; go back a few mm
G1 H1 X-305 Y-305 F300 ; move slowly to X and Y axis endstops once more (second pass)
G1 H1 Z-305 F300 ; move Z down stopping at the endstop
G90 ; absolute positioning
G92 Z0 ; set Z position to axis minimum (you may want to adjust this); Uncomment the following lines to lift Z after probing
G91 ; relative positioning
G1 S2 Z2 F120 ; lift Z relative to current position
G90 ; absolute positioning -
@Veti said in Z offset is .030 too high after starting print?:
i think you will need to allow negative movement.
try
M208 X0 Y0 Z-1 S1 ; set axis minimaNote that if you do this with an endstop, the homing move on the Z axis will set the position to -1 since that's what the minima is set to.
In your homeall you have a G92 after the Z axis homing move to reset the position to whatever you want. Currently 0. So if the resulting position isn't accurate, you can adjust this G92.
However, this assumes your bed is level and perfectly flat.
How are you measuring 0.03 anyway?
It sounds like your BLTouch was faulty. Was it a clone? What version?
-
@Phaedrux When I homeall, the offset shows 0. Once I start the print it says Z is .030 under head position on the Machine Status screen, and then it starts printing in the air above the bed. It's really weird.
Not sure what version my BLTouch is... I bought it over a year ago and only tried putting it on now. Maybe i should get a brand new one and try again? The housing says 3DTouch on it, but the PCB says BlTouch. no idea of it's a clone.
-
@TheBasedDoge said in Z offset is .030 too high after starting print?:
3DTouch
that is a clone. they tend to be unreliable.
@TheBasedDoge said in Z offset is .030 too high after starting print?:
Once I start the print it says Z is .030
what layer height have you specified in your slicer.
the first print starts at the layer height that you specified. it never starts at 0 because there would be no space for the plastic to go. -
@TheBasedDoge said in Z offset is .030 too high after starting print?:
3DTouch
It's a clone. Get a genuine Antclabs BLTouch V3.1.
There are other good probe options. The DC42 IR probe is really good as well. The print surface will need to work with the IR sensor though.
-
Ok, I guess i'll order another real BLTouch. Im using PEI over glass so I dunno if an IR probe will work
In the mean time i still need to figure out the weird offset issue. My layer height is .2 right now, using Cura to slice.
-
Can you post the first 50 lines or so of your sliced gcode file?
Do you have an offset configured in cura?
Are you able to use the baby stepping function in the web control to adjust your first layer to print properly?
Have you calibrated the extruder so that you're getting the right amount of extrusion?
-
No offset configured in cura.
I can use the baby stepping to fix it but I have to click it a ton of times... I've just been manually turning the z motor to adjust the offset.Here is the GCODE:
;FLAVOR:Marlin ;TIME:10883 ;Filament used: 5.77495m ;Layer height: 0.1 ;MINX:117.122 ;MINY:126.967 ;MINZ:0.3 ;MAXX:183.437 ;MAXY:171.213 ;MAXZ:74.4 ;Generated with Cura_SteamEngine 4.4.0 M140 S60 M105 M190 S60 M104 S225 M105 M109 S225 M82 ;absolute extrusion mode G1 Z5 F15000 ;Move the platform down 5mm G28 ;Home ;Prime the extruder G92 E0 G1 F200 E3 G92 E0 G92 E0 G92 E0 G1 F1500 E-6.5 ;LAYER_COUNT:742 ;LAYER:0 M107 G0 F2215.4 X118.845 Y138.206 Z0.3 ;TYPE:SKIRT G1 F1500 E0 G1 F1200 X119.46 Y137.693 E0.03996 G1 X119.512 Y137.65 E0.04332 G1 X120.337 Y136.988 E0.09609 G1 X121.752 Y135.797 E0.18837 G1 X122.38 Y135.373 E0.22617 G1 X122.98 Y135.054 E0.26007 G1 X123.046 Y135.02 E0.26378 G1 X124.288 Y134.392 E0.33321 G1 X126.703 Y133.084 E0.47023 G1 X129.059 Y131.72 E0.60605 G1 X130.064 Y131.104 E0.66486 G1 X130.114 Y131.074 E0.66777 G1 X130.708 Y130.723 E0.70219 G1 X130.795 Y130.673 E0.7072 G1 X131.073 Y130.519 E0.72305 G1 X131.446 Y130.339 E0.74372 G1 X131.917 Y130.145 E0.76913 G1 X132.007 Y130.11 E0.77395 G1 X132.443 Y129.944 E0.79722 G1 X132.726 Y129.849 E0.81212 -
Can you try updating to the latest 2.05 firmware release?
-
I did that yesterday actually, no change
-
@TheBasedDoge said in Z offset is .030 too high after starting print?:
G0 F2215.4 X118.845 Y138.206 Z0.3
are you sure the web gui is report 0.03 and not 0.3 ?
-
Yes ^
Ok, so I tried PrusaSlic3r and it's not doing it? Where in Cura would be causing this weird issue?
-
Can you save a .3mf file from cura and post it somewhere to share it here?
-
sure, try this
https://www.dropbox.com/s/wnt6123go95dghe/test.3mf?dl=0 -
That .3mf doesn't seem to open at all in Cura.
