Strange move of 0 Point for Z axis when using mesh
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In the meantime I fear that is related to the fact, that the sensor do not give reproducable results for my glass bed :(.
What I have done to come to this conclusion: With help of a piece of paper I measured manually 9 points in a 200 x 200 mm square. Afterwards I defined the same square and the 3x3 matrix with M557. The result was frightening: Even for the point where homing was made before a height of 0.3 mm is measured and the other results do not really fit to my manual measured results.
So - do you think I would get better results wit the new BL touch? I read something about an ultrasonic sensor but didn't see any sensor like this. Any other suggestions?
Best regards
Holger -
Is your glass bed backed by a black surface as the fitting instructions require?
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No because there is written:
works as-is if placed directly on a PCB bed heater or other surface that does not reflect strongly.
and it ist directly placed on a PCB bed heater…
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and is that PCB Heater perfectly plain or does it have any printing on it?
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No - there is a printing on it, but I checked already whether there is a difference or not - it does not matter. The lack of accuracy is all over the area
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What colour is the PCB heater?
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Bet it's red with white printing on it and shiny to boot?
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It is red to brown with black printing
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Try putting black paper between the bed heater and the glass.
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Not sure if my issues are same - but def similar … Ive LOST Z0 and cannot seem to get back to it with a BL Touch ...
