Another useful feature would be to add infill just up to a distance from the wall and leave the inner area of the part empty.
Another useful feature would be to add a second wall after that shorter infill so the printed part could be like a sandwich made of a stl wall and a slicer generated short infill and a slicer generated inner wall.
The double wall infill between the perimeters was designed on the 3d cad. The function I´m suggesting would have a similar effect but the infill could have only one wall.
This would be useful for many things and would save much plastic and hours at the 3d cad.
