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We have the problem that our machine automatically performs a Z-homing when our software connects to the Arduino, but only the Z-axis. We would like to disable it, but could not find the line in Marlin to do it. Any idea?

The software we developed is called OC-Manager3 and the machine is the OCLab3 which is working like a 3D printer but doing different jobs of analytical chemistry.

However, if we serially connect our Raspberry Pi either from Thonny or Visual Studio to the Arduino (booting the Arduino), the same Z-homing occurred. Thus, it is not related to our software but obviously to Marlin.

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    $\begingroup$ Maybe share which machine it is and what firmware version? And what is "our" software? Homing on connection is not normal, so this must be induced somehow. $\endgroup$
    – 0scar ♦
    Commented Dec 23, 2022 at 13:39
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    $\begingroup$ Welcome to 3D Printing! When you get a chance, please take the tour to understand how the site works and how it is different than others. $\endgroup$
    – agarza
    Commented Dec 23, 2022 at 14:08
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    $\begingroup$ Most probably it is related to your config setup, I see that you have a MAX Z endstop, it is more usual to have a MIN Z endstop, but that shouldn't be the problem. None of my Marlin version exhibits this issue, it must be the configuration causing this. $\endgroup$
    – 0scar ♦
    Commented Dec 24, 2022 at 16:09

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Seems like you are looking in the wrong place. I am pretty sure that this unnamed software of yours is what sends a homing command when opening connection. Best way to test is just connect to it from another control software like Pronterface, Arduino IDE or any USB serial software and it will not do that because they don't tell the printer to home Z.

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  • $\begingroup$ Hello, Gerge! Glad to have you here. As you mentioned, without additional details it is difficult to offer a proper solution. After gaining enough reputation, you will be able to post comments that can ask for clarification from the original poster. I would also recommend that you take the tour to better understand how the site works. $\endgroup$
    – agarza
    Commented Dec 23, 2022 at 23:36

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