Currently, the setting to determine the distance between your support material and actual model is defined by layers. This distance setting can have a large effect on the surface finish of your first layer printed above support material. When printing at a layer height like 0.3mm for example, we are limited to a minimum vertical separation distance of 0.3mm (1 layer). If we could change it so that the vertical separation distance was like slic3r, which is defined by a distance and not layer number, then it would be possible to get a lower separation distance (and as such, a better surface finish), even when printing with higher layer heights.
For example, with slic3r I can print a model at a 0.3mm layer height, but have the support separation distance set to 0.15mm. This gives a very good surface finish. A higher distance like 0.3mm doesn't give a very nice surface finish as the gap allows the extrusion to sag etc.
With s3d, this isn't possible. On a 0.3mm print, the lowest I can set my separation distance to, is 0.3mm (1 layer)
To do this, s3d would need to add an additional layer of support than usual before the part is printed on top, of height (layer height - contact distance). I don't think this would really be too hard to do.
Have many other people experienced this as a problem and would like this feature added?