Re: Mini Kossel bed leveling

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umdpru
can you provide a primer on using your calibration notebook?

I plan to improve the comments in the notebook a bit. Especially because what I considered radial movement is diagonal for some other people (and vice versa). I'll avoid these terms. There are also some conditions when required adjustment directions change. This is about how far points LFR are measured. Maybe I'll get free time to do it this weekend. Check for new commits in the github repository.

Anyway I do not plan to do some kind of manual calibration tutorial mostly because:

• there already is a lot of them (though they sometimes contain misleading information and they are almost always incomplete)
• it would be too long since a lot of terms would need to be defined (e.g. what is a virtual tower) and a lot of preconditions would need to be enumerated and explained
• it is a pain to do it manually anyway (believe me I had tried, and then I rather wrote down the equations in the maxima notebook)
• I just do not have time to do it now or in the near future

If you want to use the math supported option in the notebook then there is not much more to write anyway. Many maxima tutorials are out there. And once you know maxima all the rest is straight in the calibration.wxm. I doubt there is anything more to write.

People should try Rich's firmware. If they have only one calibration error then there is a good chance it will converge well.

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umdpru
L/F are both slightly high but the same and point R is low (below the build plate) on my 3DR Simple. The current position for my Z-tower is X:0, Y:Delta_Radius. If my understanding is correct, you are suggesting that tower Z needs to virtually move closer to R radially? Or, should I move tower X closer to R via changing it's Delta_Radius?

You need to move the tower which is against point R (I do not know which one it is since the picture is gone). The tower needs to be moved nearer or further from build bed centre. The direction of the move depends on how far you measure the point R. In most cases, people measure it far enough. In such a case, it needs to be moved in firmware a bit further away from centre. Positions of the other towers should not change. Endstops may need adjustment after the each tower position change. This should give you points LFR at the same height (in your case all a bit higher). Then you will need to adjust diagonal rod or delta radius or both of them to get all the 7 points to the same height.