Configuring the Software - 3D Printing: Build your Own 3D Printer and Print your own 3D Objects - page 77

Note
You've probably noticed a lot of strange terms are found in Repetier.
Most of these items (such as Density or Skirt Height) can simply be
configured based on Printrbot's recommendations, but if you're really
wanting to delve deeper into 3D printing, you'll want to spend some
time reading over the Repetier Help files for a better understanding of
the terms and how they apply to your 3D printer. This is a beginner
level book, and a complete understanding of all of these strange settings
isn't required to use your 3D printer, but it will help as you gain skills
and seek to print more advanced objects, so take some time to start your
own research into all of the settings offered by Repetier (or the software
you choose to control your 3D printer).