Relative or absolute distances?

[peirof]

Hi,

What option its better? Absolute or relative extrusion distance...

In what cases are recommened absolute or relative?

There are to make some changes in config.g, if i use one or another?

[dc42]

RepRapFirmware supports both. There is less to go wrong if you use relative extrusion.

You don't need to change config,g if you make sure that your slicer start script includes M83 if you use relative extrusion, or M82 if it uses absolute extrusion.