# Focus test Z travel to 100mm

**URL:** <https://forum.lightburnsoftware.com/t/focus-test-z-travel-to-100mm/82883>\
**Category:** LightBurn Software Questions\
**Tags:** focus\
**Created:** [November 26, 2022, 1:37pm UTC](https://forum.lightburnsoftware.com/t/focus-test-z-travel-to-100mm/82883 "2022-11-26T13:37:02Z")\
**Posts on this page:** 3\
**Page:** 1

<div class="post-metadata">

**Author:** ![davorin](https://forum.lightburnsoftware.com/user_avatar/forum.lightburnsoftware.com/davorin/32/51335_2.png) [@davorin](https://forum.lightburnsoftware.com/u/davorin)\
**Post date:** [November 26, 2022, 1:37pm UTC](https://forum.lightburnsoftware.com/t/focus-test-z-travel-to-100mm/82883/1 "2022-11-26T13:37:02Z")

</div>

Good afternoon (o;

Completed my retrofit of an Anycubic Mega X printer to a small LED laser engraver:

 ![IMG_3039](https://forum.lightburnsoftware.com/uploads/default/original/3X/8/5/8542bd788c8c30ea80aa8f7466e0de6e2bc16c46.jpeg)

But as the Z-height is over 200mm for this machine I see that the focus test parameters are limited to 100mm maximum…

Is there a way to add a Z-offset to the focus test?  
Even in layer settings I can’t set Z-offset lower than -100mm…

I tried with:

```auto
$H
G0 Z-100
G92 Z0

```

Which works on the first run…the second time it wants to set Z Zero at Z-200.

thanks in advance  
richard

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<div class="post-metadata">

**Author:** ![davorin](https://forum.lightburnsoftware.com/user_avatar/forum.lightburnsoftware.com/davorin/32/51335_2.png) [@davorin](https://forum.lightburnsoftware.com/u/davorin)\
**Post date:** [November 26, 2022, 2:36pm UTC](https://forum.lightburnsoftware.com/t/focus-test-z-travel-to-100mm/82883/2 "2022-11-26T14:36:18Z")

</div>

Ah it seems Grbl needs a G92.1 at first…:

```auto
G92.1
$HZ
$HX
$HY
G0 Z-100
G92 Z0

```

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<div class="post-metadata">

**Author:** ![system](https://forum.lightburnsoftware.com/user_avatar/forum.lightburnsoftware.com/system/32/64335_2.png) [@system](https://forum.lightburnsoftware.com/u/system)\
**Post date:** [December 26, 2022, 2:36pm UTC](https://forum.lightburnsoftware.com/t/focus-test-z-travel-to-100mm/82883/3 "2022-12-26T14:36:22Z")

</div>

Closed on December 26, 2022, 2:36pm UTC

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