Is auto bed leveling actually tested?

[thorleifjacobsen]

On my bed it does the 4 point leveling, i've put it a little off on the left side just for fun.

But when i start to print after enabling everything just as the guide says it actually pushes the plate down on that side which is a little higher. But the left side where it first probed is perfect.. It just dosent look like this works on ultimaker?

[alexborro]

You probably have reversed coordinates. With the printer facing you and looking from above, the 0,0 is the lower left corner. Anything other than that will make a mess with BAL.

I'm gonna place this instructions in the reade.me

Cheers.

Alex.

2014-09-30 23:09 GMT-03:00 Toffe87 notifications@github.com:

On my bed it does the 4 point leveling, i've put it a little off on the left side just for fun.

But when i start to print after enabling everything just as the guide says it actually pushes the plate down on that side which is a little higher. But the left side where it first probed is perfect.. It just dosent look like this works on ultimaker?

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Alex Borro

[thorleifjacobsen]

alexborro, i've not edited the code (other than adding servo pin and enabling the stuff that the tutorials says) and uses a original ultimaker. Should not be reversed then? I dont even feel the Z-stepper doing anything. holding the rod to feel for movements.. should be about 2-3mm movements on my testing jig.

[oysteinkrog]

Auto bed leveling works very well for me, here is my config: https://github.com/oysteinkrog/Marlin/blob/config_i3/Marlin/Configuration.h The test you describe (holding z rods to feel for movement) is positive for me, if my bed is very uneven (which has happened after rebuilding stuff etc) I can even see the z rods turn during X/Y moves.

[thorleifjacobsen]

Great to hear Øystein! You use an RAMP. I'm using an Ultimaker, on the Ultimaker the "servo0_pin" isent even defined, so i dont think this software is completely compatible with ultimaker. If anyone successfully got this working with an ultimaker i'd be glad to see.

Another thing i might have been doing wrong: I had "AUTO0.G" on my SD card to always probe on startup.

; Z-Probing M84 M402 M1 ;wait until user's ready G28 X0 Y0 ;move X/Y to min endstops G29 Y3 ;detailed z-probe G28 X0 Y0 ;Back to XY min.

I read somewhere that G28 may clear out the probing information. But unfortunately the 3d printed mount for servo broke on the last try so i had to stop testing. I did some in air testing and changing the last G28 X0 Y0 to G1 X0 Y0 and it did not work out well. It crashed in the wall and the stepper went crazy. Can anyone confirm that G28 clears the autolevel data?

[galexander1]

From Marlin_main.cpp:

 ...
case 28: //G28 Home all Axis one at a time

ifdef ENABLE_AUTO_BED_LEVELING

  plan_bed_level_matrix.set_to_identity();  //Reset the plane ("erase" all l

eveling data)

endif //ENABLE_AUTO_BED_LEVELING

 ...

G28 does clear the ENABLE_AUTO_BED_LEVELING matrix.

[thorleifjacobsen]

That might have been my problem all along, I'll see if i manage to trick it to print a new servo mount and try again! Got a really pricy metalgear servo that might do the trick and last a while too :)

[jamesgao]

I just tried the latest version of the bed autolevel on my delta printer, and it's all sorts of broken for deltas. With the G29 command, the Z carriage keeps moving down until it slams into the bottom of the rail. I believe it's because the probe_pt function in Marlin_main.cpp is trying to move the the effector in stepper coordinates instead of cartesian coordinates (which are one and the same in cartesian printers), but I don't know the code well enough to figure it out.

Is there a preferred branch for delta bed leveling?

[galexander1]

For better or for worse, this is still a practically useful branch for delta:

https://github.com/jcrocholl/kossel

It has a different auto-level hack than the one in main-line Marlin. It probes the bed at a grid of coordinates and then applies a straightforward z correction. It doesn't attempt to do any systematic correction such as spherical or what-not. Plus it is tested on deltas.

[errolt]

The branch is at https://github.com/jcrocholl/Marlin, but it is 6 months old.

Also, if bed leveling is known broken for delta then there should be an #ifdef to throw an error if both DELTA and ENABLE_AUTO_BED_LEVELING is enabled. This will prevent damage to printers...

[boelle]

@Toffe87 did you get the servo issue fixed?

[boelle]

no comments since 11 nov besides my own... also the title says if autolevel have been tested... a very wide hitting title... many are using auto bed level so you can say yes it has been tested... but on the ultimaker is might be a total different issue...

but since the lack of "action" i will close this one for now... as with all other issues i have closed they can always be reopened should the OP come back

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