area except the boundary margins in this manner the freeform fabrication system can be adapted and adjusted to the use of a particular filler substance moreover given a predetermined system accuracy shrinkage control and homogeneous mechanical strength can be significantly improved by the differential control with respect to boundary regions and large structural area regions respectively fig2 and 3 show alternative embodiments or modifications of the fabrication system of fig1 and further illustrate a principle of the present invention while the relevant portion including the specifically selected and defined area or volume of the material to be solidified in a desired building region is illustrated both in fig2 and fig3 other components and conditions may be the same as shown in fig1 according to fig2 a variation of energy density is applied where energy density is unusually increased from a surface where electromagnetic radiation and or synergistic stimulation impinges on the material to be solidified towards a surface of previously solidified three dimensional object 9 i e in the z irradiation direction within building region 8 formed in the gap this is illustrated in fig2 by a gradually increasing energy density from e 0 to e 1 thus contrary to an unmodified system where a decrease of energy density from e 0 to e 1 would be enhanced by the presence of a filler substance an unusual variation in energy density in building direction z i e throughout the exposed xy plane is applied this may be accomplished by.