Add variable extrusion width, printspeed up for smal nozzles

[Trax]

Hello,

S3d allows the user to set the extrusion width and the nozzle width, since this are two settings s3d should be smart about using them.
As it is now, the nozzle width seams to be ignored and the extrusion width seams to be fixed.

I would like s3d to print where it can with the set extrusion width, but for smaller features if needed intelligently and automatically reduce the used extrusion width down to the set nozzle size.

So that I can for example print my print with typically 0,4 mm extrusion width but still be able to have 1mm walls filled in and stable,
instead of (as it is now) just an empty shell with a 0.2mm gap in between.

The free software Slic3r can do that somewhat, and I believe this would be a great improvement for s3d.

Please add this to the next build.

Cheers
Trax

[Trax]

I stumbled over a workaround for the missing of this feature,
if needed one can use one extruder set to 0,2 for the shell, and the other set to 0,4 or more for infill