# Macros and Slicer

This section explains how to add macros to your printer.cfg file, and the settings you need to change in your slicer to take advantage of them.

The two macros that will be added are:

* \[gcod&#x65;_&#x6D;acro_ START\_PRINT];
* \[gcode\_macro END\_PRINT]_;_

Simplify3D is the slicer that will be used to show how to take advantage of these macros (should be a similar process for the slicer of your choice).

{% hint style="info" %}
These steps are optional, you can leave Start/End gcode in your slicer and still be able to print a file successfully in Klipper.  If you will not be doing these Macros, you can continue to the [First Print](macros-and-slicer/making-prints) section.
{% endhint %}
