Bed not levelled after Auto Level May 18, 2016 08:30PM |
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Re: Bed not levelled after Auto Level May 18, 2016 09:53PM |
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Re: Bed not levelled after Auto Level May 19, 2016 10:47AM |
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Re: Bed not levelled after Auto Level June 07, 2016 07:19AM |
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Re: Bed not levelled after Auto Level June 08, 2016 04:54AM |
Registered: 8 years ago Posts: 916 |
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TheYear2525
Hello,
I'm experiencing probably the very same problem with my Sintron Kossel Mini (delta printer). Initially my z-Probe assembly was very wonky and the spring that pushes the probe against the bed was way too strong, possibly twisting the whole hotend a bit during the individual probing movement. Recently I redesigned it and also made it simpler thus more precise. I'm positive that now it's much more precise, but the result ist the same: after the auto bed level procedure the bed seems to be still more than 0,5 mm higher on one side than on the other (it doesn't look like a delta typical bowl deviation). For big prints the head scratches the bed with no filament flowing on the one side an on the other it doesn't adhere due to the big gap. In the middle however there is an area where it works fine.
I'm wondering if the recorded bed z information actually gets written or retrieved from the eprom. I can't see if there is any corretion happening at all or not (because auf the delta design).
Shouldn't the bed at x=0, y=0 read z = 0 after the level procedure ? I'm asking because I still have to set a z height correction in slic3r. Might that be a hint that the bed leveling doesn't get stored? Does it get stored on all boards anyway or am I supposed to not turn off the printer after the procedure?? That thought ocurred to me just recently, I'll test that later today. I think I never testet that (again) because I once got dangerous movements and head crashes after the auto level procedure and not resetting the board afterwards. Maybe that was just coincidence? I could build a 3 point adjustmend for the bed, but that would make the auto bed levelling pretty obsolete, wouldn't it (except the bed is no perfect plane) .
My questions in short:
Does the usual Arduino Mega 2560/ADK with Ramps 1.4 retain auto level information after a reset/power off?
If so, why does it still look like no correction is done?
Should the z value (retrieved by the m114 command) after level procedure defiantely read 0 at the bed center? (or does it still read the "uncorrected" value and the correction is done without showing?)
Regards
Edit: I tried bed levelling today without turning the board off afterwards - same result. Now that I think of it I already mechanically levelled the bed twice in the past. It should be 1 mm higher on the side that was too low. But it isn't. It's the same like alsways since I got the printer. That must mean that the error is introduced by be electronic auto bed level. My only idea here so far: could the delta rods have different lengths? (although I measured them an screw them to equal length - I'll re-measure them today)
Regards
Re: Bed not levelled after Auto Level June 08, 2016 05:56AM |
Registered: 7 years ago Posts: 4 |
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nebbian
Are you using Marlin? Are you homing after doing a bed level? If so then there's your problem.
Re: Bed not levelled after Auto Level June 08, 2016 10:18AM |
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Re: Bed not levelled after Auto Level April 10, 2017 02:53AM |
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Re: Bed not levelled after Auto Level May 03, 2017 10:38PM |
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