Baby Stepping Not Effective? Z Probe offset does nothing?
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you should probably post your config, also what is your Z offset set to?
edit: missed the config link, let me look
have you tried homing X and Y only, and then moving the probe to the center of the bed then using G30 to home with the probe, I dont see G30 used in your homing files, this tells the firmware to home l;istening for the probe to trigger, and then measuring the distance from the nozzle to the bed. If you still are still you a Z endstop as well as a Z-probe, you wont be able to use compensation or probe homing as it conflicts with the use of those features.
The homing files are the same as when I got the firmware and all that set up from the get go. As in, I loaded up the firmware, and all I ever did was change the G92 to the value I had thought was needed. And then added a G1 move so that the nozzle would go to the probed location once the homing was done. I'm just now finding out that there is a G30 that needs to be used for such things as well. Its all located inside the bed.g file apparently, and that's where things seem to be screwing up if I'm looking at everything right.
I genuinely do not know how my printer was ever working so amazingly well the first time if all the values I had entered literally had done nothing lol. Must have been insanely lucky and just had the probe at the exact height needed.
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Ok following the thing I wrote above, I had to lower the nozzle to -.70 to get the paper to just barely catch.
I then moved the probe back to where it needs to be to reprobe, told it to move up 10mm so that G30 S-1 could work, and when it ran, Z was at .66mm. So with those numbers, I am assuming the .66 needs to go in the G31 command in the Config.g? Wait… no... that wouldn't make as much sense... it would need to add the difference between the .66 and the -.70 so that it would actually lower itself enough, correct?
EDIT:
Nah disregard the last thingy there. If I send G92 Z0 to clear it out, and then tell it to lower by .66 then it fits perfectly still. So I didn't need to add anything onto that.EDIT2:
I think I see what Sniffles means. It appears that the homing files are just set to detect an endstop, and not to be used with a probe. So instead of it being Z-9999 S1 it should just be G30, Correct? -
correct, and if you have a Z-min endstop that is in use on the printer, and the height that the nozzle needs to reach is below that Z-min endstop, you will crash into and possibly dmamage the Z-min endstop. it is better to not use one when using a probe to home and probe the bed. you are better off to use the probe to home and physically remove the Z-min endstop as it is being physically replaced and functionally replaced by the Z-probe.
It wasnt stated if you use a Z-min endstop, I am just stating the reason why you don't need one, just in case you do.
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correct, and if you have a Z-min endstop that is in use on the printer, and the height that the nozzle needs to reach is below that Z-min endstop, you will crash into and possibly dmamage the Z-min endstop. it is better to not use one when using a probe to home and probe the bed. you are better off to use the probe to home and physically remove the Z-min endstop as it is being physically replaced and functionally replaced by the Z-probe.
It wasnt stated if you use a Z-min endstop, I am just stating the reason why you don't need one, just in case you do.
Nope I don't have a Z end stop, just the inductive sensor. I didn't know that the homing files were automatically set up for end stop usage. As previously stated, the files were set up just as they are when the duet is initially started up with the exception of a movement command and changing the reported value.
Also, after some trial and error with the G30 inserted in the homing files instead of the G1 Z-9999 S1 commands, it has successfully homed and returned to the proper location for Z0!
NOW I just need to hope and pray it STAYS THAT WAY after it does the quick 5 point 'bed compensation' if it does that, then hopefully everything should be set!
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ALRIGHT! I'm closer finally! After a bed compensation, THINGS HAVE CHANGED… Except, now its too low (by .60) instead of being several mm higher. Least now I've gotten somewhere and not feeling like I'm demonstrating the definition of insanity!
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SUCCESS! I changed the G31 value in the 0.94 and it appears to be as perfect as can be after a bed compensation! .66 was too low apparently, and so I added the difference it was missing and then it became too high, and slowly took away .10 from it until after a bed compensation it fit the paper just right!
Starting a quick print to see if it actually remains working. And if it does, THANK YOU ALL SO MUCH for putting up with an idiot such as myself lol. I wouldn't have ever known that G30 was needed in the homing files if it wasn't for all of you!
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No worries. Enjoy, don't let it annoy you more than absolutely necessary.
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FINALLY! Print started and its actually sticking!
Thanks again so much guys. Never would have figured it out or gotten it to work at all on my own. Power of the internet for ya!
Also, sorry for the large picture if it shows up that way. I did the preview thingy but I couldn't figure out how to make the image smaller…
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Glad yo got it sorted and your frustrations are at an end. So NOW you can use baby stepping if necessary to make fine adjustments to that first layer.
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BTW, something that tripped me up for a few hours, is that if your config.g includes M501 (to apply config-override.g), this will also change the probe offset from G31, because the probe offset is included in the saved data from M500.
So I was adjusting the Z height in config.g then issuing it manually in the Gcode console during tuning, have it work just fine, then I would lose my changes the next time the Duet rebooted even though I had adjusted my config.g! This made it seem like my Z sensor was inconsistent and set me off a wild goose chase trying to fix a non-existent problem.
In the end I decided that config-override.g was just hiding important config bits to another file, so I disabled M501 and put everything in config.g, this made everything work as expected. IIRC @deckingman you don't use config-override.g either, now I know why.
Cheers,
Ben. -
…................................IIRC @deckingman you don't use config-override.g either, now I know why.
Cheers,
Ben.Yup. Sooner or later it'll bite you in the ar.. I prefer just to have one file that contains all the settings. Admittedly, I have to make note of changes and manually edit config.g, so it's not as convenient as using M500 but personally, I'd rather do it that way.
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Well I recall David was reluctant to have a config override and this is why. It gets me from time to time. Maybe it would be possible to pop up something to say "would you like to save?" when it's a command saved into config override, it's only a short list of commands?
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The parameters stored are listed in the wiki entry:
https://duet3d.com/wiki/G-code#M500:_Store_parametersI also resisted using M500 but now just use it to save typeing, especially after delta calibration:
Run M500, go to system files, open config-overide.g, copy the values. open config.g paste the values….
Maybe I should just remove them from config.g completely and only use the config-override.g values now i think about it!
