Process of support removal for fused deposition modeling

A process for producing three-dimensional objects having overhanging portions freely suspended in space comprising:

• dispensing a first, solidifiable structural material in a predetermined pattern, to deposit multiple layers of said material defining a three-dimensional composite body comprised of both a three-dimensional object and a separate three-dimensional support structure underlying overhanging portions of said object requiring support during layer deposition, with the object and the support structure being separated by a space therebetween defining the underside of said overhanging portions of the object;
• and
• dispensing a second, release material in said space between the object and the support structure, in a multiple pass deposition process coordinated with the dispensing of said first material and in contact therewith, with said second material being of a different composition than said first material such that said second material forms a weak, breakable bond with the first material in a readily separable joint in said space between the object and the support structure.