Travel re generator settings
SplineTravel re-generates all travel moves in the G-code file being processed, except for the very first one and the very last one (those make through intact, as generated by slicer). SplineTravel considers everything between build moves (build moves are those with positive E change and nonzero position change) to be travel moves, and thus it can absorb complex travel moves. Currently (as of rev. 73), many non-move commands (such as fan speed commands) between build moves will be ditched, too (this needs a fix).
Sets the length of retraction. This is either the length of raw filament in mm, or may be the volume (or whatever units are active in the G-code file being processed; SplineTravel is not aware if that yet).
Retracting is going to be generated for all travel moves in the file, except for the very first one and the very last one. Retraction commands issued by the slicer will be overridden.
Setting retraction to zero will disable retraction completely (again, slicer's retraction commands will be overridden)
If this button is down, travel moves are going to be replaced with smooth Bezier curves, constructed in order to match the exit speed of previous build move and enter speed of the next build move.
You can read about Spline travel settings on a dedicated wiki page.
Conventional travel commands. Note that even in this mode, slicer's travel commands will still be replaced with new ones.
You can read about straight travel settings on a dedicated wiki page.