# Instructions - How To Make And Set Up A Z-Probe On The M4

**URL:** <https://forums.maslowcnc.com/t/instructions-how-to-make-and-set-up-a-z-probe-on-the-m4/22474>\
**Category:** Wiki - Store and maintain knowledge\
**Tags:** accuracy, z-axis, z-probe\
**Created:** [October 8, 2024, 9:37pm UTC](https://forums.maslowcnc.com/t/instructions-how-to-make-and-set-up-a-z-probe-on-the-m4/22474 "2024-10-08T21:37:50Z")\
**Posts on this page:** 1\
**Showing post:** 34

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**Author:** ![Andith](https://avatars.discourse-cdn.com/v4/letter/a/6f9a4e/32.png) [@Andith](https://forums.maslowcnc.com/u/Andith)\
**Post date:** [December 1, 2024, 6:45am UTC](https://forums.maslowcnc.com/t/instructions-how-to-make-and-set-up-a-z-probe-on-the-m4/22474/34 "2024-12-01T06:45:26Z")

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> [@MrN808](#):
>
> In editing maslow.yaml, you say to find the “probe:” section and replace what’s there with different values. In my fresh v0.86 maslow.yaml, I could find no such section. When I added the entry—my physical setup emulated yours exactly—I got errors.

Ah, got it. When you calibrate the machine, the maslow.yaml file gets restructured and several things get filled in and moved around. I believe the “probe:” entry is added in automatically by FluidNC during that process. So, try calibrating first then download the calibrated maslow.yaml file and open that file in a text editor like Notepad. Hopefully, it should be in there now.

Also, if you have a recent backup of your yaml file that is post-calibration, you can likely find the setting there and use the backup. I don’t think much often changes on the yaml side of things and using an older one is usually ok.

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