Mesh bed leveling problem

[pedro-dreyer]

Hi,

I am having some problems with the mesh leveling. Here is the problem:
I use a Z max endstop and have a Z_MAX_POS 47 in configuration.h. However when I input aG29 S1 command and the printer homes itself, the Z height given by aM114 command is equal to 1 which is what I have in MESH_HOME_SEARCH_Z.

Am i am doing something wrong?

Marlin Firmware version: 1.1.0-RC6

[Roxy-3D]

You only have 47mm above the print bed? Do you have a Z-Probe to measure the position of the bed?

[pedro-dreyer]

Yes, only 47mm. I do have a Z-probe but I deactivated it since that according to the wiki* there is no automatic way to probe the bed. So I was employing the manual method, using a piece of paper to attest when the nozzle touched the printer bed.

*https://github.com/MarlinFirmware/Marlin/wiki/Mesh-Bed-Leveling

[epatel]

This commit addressed max Z endstop with MBL. Could you make sure you have this in the version you are trying?

#4146

The documentation does not address Z max endstop. But the process should be similar. First a HOME should be performed and then it should move to a position slightly above the bed, and the SEARCH value is a distance that should be farther than reaching the bed, i.e. 4 mm was suggested earlier if Z min endstop was placed slightly above the bed. The manual process does not allow manually moving (searching/closing) towards the bed than this value.

[Roxy-3D]

Well, the whole purpose of the Z-Probe is to measure how high the nozzle is above the bed at a given coordinate. If you are willing to try a 'Development' branch, the Mesh Bed Leveling concept has mostly been automated (to use a Z-Probe). That branch has the tools in place to very quickly and accurately tune your Mesh.

And if you re-read that first paragraph of the Wiki, it has changed.

@epatel You will have a smile on your face when you get the time to bring up: https://github.com/MarlinFirmware/Marlin/tree/devel-ubl

[epatel]

See this comment #4088 (comment)

[pedro-dreyer]

I was not using the updated commit by @epatel . I am getting it now. Lets see if it works.

Regarding the UBL branch, it says in its documentation that I need to have a LCD panel, which sadly I don't. I can have a look at the code to see if I can get it to work without one though. I will update this thread with any news. Thanks

[Roxy-3D]

I can have a look at the code to see if I can get it to work without one though.

Don't even try! The system was designed to be able to be used without an LCD Panel. But right now, the code to do that isn't there. It won't work. Soon (in 1 or 2 months) it will work without an LCD Panel. My suggestion is if you want to use UBL is spend $10 and order this: http://www.ebay.com/itm/251242416836?_trksid=p2057872.m2749.l2649&ssPageName=STRK%3AMEBIDX%3AIT Otherwise, in about 6 weeks or so, you can do it without an LCD Panel.

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