Download the latest release here. Make sure to select the release targeted towards the version of Inkscape you are using. You can find the version of Inkscape you're using under Help > About.

Unzip the files directly into the Inkscape user extensions folder. Inkscape lists the location of your extensions folder under Edit > Preferences > System.

Restart Inkscape and you're done.

Documentation

Basic command

Pen Up: M5 S0
Pen Down: M3 S1000
Pen Delay: P4 P<your delay ms>
Pen Speed Movement: G1 F<your speed>

Custom G-code Header and Footer

Add "header" and "footer" text files without extensions in your destination directory to add custom commands. Don't forget to add a new line at the end of these two files.

If no files are detected the default values are :

Header : G90 ; Absolute positioning
Footer : G1 X0 Y0 ; Move to X0 Y0

For developers

Pull requests are welcome. Just make sure to test your code on both Python >=2.6 and >=3.5 for the main branch, and Python >= 3.6 for the development branch (In the next major release we'll drop support for older python versions in an effort to improve code readability).

Credits

This inkscape extension is adapted from J-Tech-Photonics-Laser-Tool inkscape extension.