Auto_Bed_Leveling: Enhanced G29 command

[AlexD]

Haha at the moment only just over half is useable as i am using 2 210 x 240mm Silicone heated pads, i cant seem to find an appropriate heater to use, without importing a Monster Heat Bed (18" X 18") from the US for £100+. I have a feeling the heated pads may be affecting the level significantly. Yeah i can see the advantage of using the EPROM, i just always forget to update it as i'm used to it loading from the config.

Previously i had gone through 3 sheets of 4mm Standard 'Annealed' glass, but this cracked after about 10-20 heat cycles, then the glass supplier recommended toughened, as it is heat treated in manufacture apparently, Borosilicate glass is ridiculously expensive.

Hopefully it wont take long to get the firmware tweaked this evening, i might even just try to copy my configuration & configuration_adv into the firmware that has been posted by Roxy.

Alex

[AlexD]

Hi Roxy, thanks for the reply. I have not tried the 3 Point Probing yet, i believe that was Astek, i did not try it because i thought the Grid was superior. I will flash that firmware this evening and disable the EPROM. Then begin the Probing... Thanks Again.

Alex

[eistee]

Hey Roxy,

Thank you for your ideas and enhancements to the Bed Leveling Process. I have added a inductive Sensor to my printer and included your improvements in my existing Marlin-FW. M48 works just fine and seeing the topology of my bed also helps a lot.
However, I have a few questions:
- I would like to make use of the L R F B parameters. It is obvious to me, that my slicer has to output the values. Where can i find the postprocessing scripts for Slic3r? Is there also a solution for Simplify3D (since that's my favourite software)?
- I've seen that newer versions of Marlin offer a mesh-probe to compensate uneven print beds. This is done by a bilinear interpolation approach and looks very interesting to me. Nevertheless, mesh probing is - to my knowledge - only available with manual leveling with M420 and M421. Is there a reason why there is no mesh auto leveling? In my eyes it seems like most work is already done, the combination of manual mesh probing and auto leveling shouldn't be too much work and i would like to give it a try. Am I missing something?

[Roxy]

Hey Roxy,

Thank you for your ideas and enhancements to the Bed Leveling Process. I have added a inductive Sensor to my printer and included your improvements in my existing Marlin-FW. M48 works just fine and seeing the topology of my bed also helps a lot.
However, I have a few questions:
- I would like to make use of the L R F B parameters. It is obvious to me, that my slicer has to output the values. Where can i find the postprocessing scripts for Slic3r? Is there also a solution for Simplify3D (since that's my favourite software)?

There are a couple of post processing scripts to do the LRFB stuff. If you grab the BeckDac fork up above, there is an extra folder in it with different flavors of the script. I never actually used those parameters for real prints. But I wrote the C version of the script.

- I've seen that newer versions of Marlin offer a mesh-probe to compensate uneven print beds. This is done by a bilinear interpolation approach and looks very interesting to me. Nevertheless, mesh probing is - to my knowledge - only available with manual leveling with M420 and M421. Is there a reason why there is no mesh auto leveling? In my eyes it seems like most work is already done, the combination of manual mesh probing and auto leveling shouldn't be too much work and i would like to give it a try. Am I missing something?

The Mesh leveling is interesting. But it isn't fully baked yet. It seems to me it should be able to probe the whole bed and then just use it. Kind of like the Auto Bed Leveling does. So far, it isn't that automated. The other thing I would like to see the Mesh stuff do is scale back the compensation at some selected rate. By the time it gets up 5 or 10 layers, I think it should not be doing any correction at all. Once again, it hasn't evolved to that point yet.

[AlexD]

Ok so this is the feedback from my first set of probing

RECEIVED: +0.39340 +0.05090 --0.27160 --0.61660 --1.33160
RECEIVED: +0.55590 +0.27840 --0.01410 --0.35160 --1.06660
RECEIVED: +0.65590 +0.36840 +0.14340 --0.17160 --0.81410
RECEIVED: +0.64590 +0.42840 +0.27090 +0.03590 --0.53160
RECEIVED: +0.61090 +0.46090 +0.36840 +0.19090 --0.28910
RECEIVED:
RECEIVED: planeNormal x: 0.01 y: 0.00 z: 1.00
RECEIVED:
RECEIVED:
RECEIVED: Bed Level Correction Matrix:
RECEIVED: 0.999987 0.000000 -0.005012
RECEIVED: -0.000009 0.999998 -0.001874
RECEIVED: 0.005012 0.001874 0.999986

From what i can gather its pretty out of level right?

[Roxy]

Yes... From the front left corner to the back right corner you have 2 mm of difference in height. The good news is it appears the bed is pretty flat. You should manually level the bed as best you can. Lower the front left corner .5 mm and raise the back right 1 mm. Then re-run the test and level it a little bit more. Even though it seems like you should be able to do the entire correction at once, it never works out that way. Just keep raising the low corners and lowering the high corners a couple of time.

When you get it much more level than it is now, you will be able to see if you have high or low spots on your bed. As you scan left to right or up to down, if you see the sign flip from + to - and then go back to + (or vice versa), that will indicate a low (or high) spot on the bed.

[AlexD]

I havvn't had all night to try and resolve the issue but here are a few more probes after trying to adjust, its not easy with my bed design.


RECEIVED: Bed Height Topography:
RECEIVED: +0.42460 --0.03290 --0.46540 --0.87290 --1.60040
RECEIVED: +0.68960 +0.26460 --0.12040 --0.54040 --1.25790
RECEIVED: +0.85210 +0.45960 +0.10460 --0.30290 --0.96290
RECEIVED: +0.94960 +0.59960 +0.31460 --0.03540 --0.60040
RECEIVED: +0.99710 +0.70460 +0.52210 +0.20960 --0.30040
RECEIVED:
RECEIVED: planeNormal x: 0.01 y: 0.00 z: 1.00
RECEIVED:
RECEIVED:
RECEIVED: Bed Level Correction Matrix:
RECEIVED: 0.999979 0.000000 -0.006402
RECEIVED: -0.000018 0.999996 -0.002818
RECEIVED: 0.006402 0.002818 0.999976




RECEIVED: +0.36340 +0.02590 --0.25910 --0.55410 --1.09660
RECEIVED: +0.53090 +0.22340 --0.02160 --0.31410 --0.84910
RECEIVED: +0.55340 +0.31090 +0.10590 --0.15910 --0.63660
RECEIVED: +0.53090 +0.33090 +0.20840 +0.02590 --0.35910
RECEIVED: +0.45840 +0.34340 +0.28590 +0.14590 --0.19410
RECEIVED:
RECEIVED: planeNormal x: 0.00 y: 0.00 z: 1.00
RECEIVED:
RECEIVED:
RECEIVED: Bed Level Correction Matrix:
RECEIVED: 0.999992 0.000000 -0.004072
RECEIVED: -0.000006 0.999999 -0.001534
RECEIVED: 0.004072 0.001534 0.999991






RECEIVED: +0.34800 +0.08300 --0.13950 --0.36950 --0.83450
RECEIVED: +0.45300 +0.21800 +0.04050 --0.21200 --0.65200
RECEIVED: +0.44800 +0.24300 +0.10550 --0.08200 --0.51950
RECEIVED: +0.34800 +0.22300 +0.14300 +0.01800 --0.35200
RECEIVED: +0.24050 +0.17800 +0.17800 +0.08050 --0.18700
RECEIVED:
RECEIVED: planeNormal x: 0.00 y: 0.00 z: 1.00
RECEIVED:
RECEIVED:
RECEIVED: Bed Level Correction Matrix:
RECEIVED: 0.999995 0.000000 -0.003162
RECEIVED: -0.000003 1.000000 -0.000814
RECEIVED: 0.003162 0.000814 0.999995






RECEIVED: Bed Height Topography:
RECEIVED: --0.00380 --0.09130 --0.14380 --0.20130 --0.54630
RECEIVED: +0.09870 +0.03870 +0.03370 --0.00880 --0.34130
RECEIVED: +0.11370 +0.08120 +0.11370 +0.09370 --0.20380
RECEIVED: +0.03370 +0.06120 +0.17370 +0.21620 --0.02130
RECEIVED: --0.10380 --0.00130 +0.19370 +0.27620 +0.13870
RECEIVED:
RECEIVED: planeNormal x: 0.00 y: 0.00 z: 1.00
RECEIVED:
RECEIVED:
RECEIVED: Bed Level Correction Matrix:
RECEIVED: 1.000000 0.000000 -0.000596
RECEIVED: -0.000001 1.000000 -0.000884
RECEIVED: 0.000596 0.000884 0.999999

[blyind]

hey, im having issues downloading the attachments from this site, ive tried every major browser and my phone, but it always loads up clear.gif...
is there any way one of you could put the files in a dropbox or something so i can get my hands on them?
i would very much appreciate it

[printbus]

hey, im having issues downloading the attachments from this site, ive tried every major browser and my phone, but it always loads up clear.gif...

3Dprintboard had some technical problems in April 2015. Many attachments posted prior to that no longer work. Nothing seems to be happening to fix the problem, so the attachments are likely lost. Can't help with the files, but now at least you know to stop trying.

EDIT: Roxy, you might consider editing your first post as required to eliminate this ongoing confusion/frustration.

[Roxy]

EDIT: Roxy, you might consider editing your first post as required to eliminate this ongoing confusion/frustration.

Agreed... I'll do that now... If you can think of anything else that should be added to the note, please speak up!