Use !default in your variables _config.scss

[zeroedin]

http://robots.thoughtbot.com/sass-default

This will allow me to use _sass-gridlover.scss but define my own config that overrides these preset defaults.

Maybe also consider name spacing your variables.

...
// Default font size.
// Don't change this variable!
$sgl-defaultFontSize: 16;

// Configurable variables.
// Ok... You can change these variables! :D
$sgl-baseFontSize: 18 !default;
$sgl-baseLineHeight: 1.2 !default;
$sgl-scaleFactor: $sgl-goldenSection !default;

[hiulit]

Yeah, you're right! I wanted to do it anyway because of this amazing article https://medium.com/@marcmintel/write-sass-plugins-like-a-pro-c765ecf3af27, so, I'm into it.

[hiulit]

Done! Let me know if it works. And if it does, I'll publish a new release.

[hiulit]

I've closed the issue because I think I fixed it, but I'm waiting for you to try it and tell if it works properly to push the new release.

[hiulit]

Have you had the chance to try it?

[zeroedin]

Yes, sorry I hadn't gotten back sooner, working as expected. Thanks.

[hiulit]

Nice! Well, I've just pushed a new release, 1.1.0, with your issue and a bunch of others, including SassDoc documentantion