# Custom Tool Setter Position

{% hint style="danger" %}
This documentation is for a in-development feature, and may be incomplete/inaccurate. Please proceed with caution.
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The location of the tool setter can be customized using the configuration elements `coordinate.probe_mcs_x` and `coordinate.probe_mcs_y`. Normally the location is set by way of reference to the toolrack but setting these two configuration keys you can use a specific MCS location.

The easiest way to set the coordinates is have a tool in the collet, and jog the spindle down so that it's above but not touching the tool setter. In the Controller take note of the MCS X and Y locations. These are the positions in small grey text in the tool bar.

<figure><img src="https://3821062708-files.gitbook.io/~/files/v0/b/gitbook-x-prod.appspot.com/o/spaces%2FutyTkVS5yYIA5lOhHRPF%2Fuploads%2Fvr9SWSn7ULmHgGeSYkYX%2Fimage.png?alt=media&#x26;token=25e7ed65-b28b-4203-afa0-b207a8ac5f0d" alt=""><figcaption><p>Highlighted is the MCS Position of the spindle as shown on the Controller in small grey text</p></figcaption></figure>

Store the settings running the below commands substituting 123.123 with the actual x and y  position values. Do note that as these will be in the MCS coordinate space, so the values are expected to be negative.

```
config-set sd coordinate.probe_mcs_x 123.123
config-set sd coordinate.probe_mcs_y 123.123
```

`reset` the machine to apply the setting, and perform a tool calibration to check the location. Make small adjustments by eye as required.

Details of the current tool setter position configuration can be viewed using the command [`M493.4`](https://carvera-community.gitbook.io/docs/dev/firmware/supported-commands/mcodes/tool-offset-management):

```gcode
M493.4
current tool offset [-67.880] , reference tool offset [-67.880]
no one-off tool setter position offsets configured
Tool setter position (MCS): X[-3.300] Y[-14.900] Z[nan]
```

### Off Center Tool Measurement

Large tools such as face mills with cutters that are not in the center can be probed off-center by using the parameters **X/Y/Z** on the [M491 ](https://carvera-community.gitbook.io/docs/dev/supported-commands/mcodes/tool-offset-management#m491-tool-length-calibration)command.

{% embed url="<https://youtube.com/shorts/QoxUf1ruP8o>" %}
Demonstration of M491 X-15
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