Three dimensional printing adhesion reduction using photoinhibition

A system for printing a three-dimensional (3D) object, comprising:

• a vat capable of holding a liquid comprising a photoactive resin, wherein the vat includes a window;
• a build plate configured and arranged to move relative to the vat during printing of the 3D object on the build plate;
• one or more light sources configured and arranged with respect to the window to direct a first light and a second light through the window into the liquid, wherein the first light has a first wavelength that is configured to induce photoinhibition in the photoactive resin, and wherein the second light has a second wavelength that is configured to induce photoinitiation in the photoactive resin, wherein the second wavelength is different than the first wavelength;
• and
• a controller that is programed to (a) direct the one or more light sources to expose the liquid to the first light and second light at a first set of intensities and exposure times to yield (i) a first photoinhibition layer having a first thickness and (ii) a first photoinitiation layer, and (b) direct the one or more light sources to expose the liquid to the first light and second light at a second set of intensities and exposure times to yield (i) a second photoinhibition layer having a second thickness and (ii) a second photoinitiation layer, wherein the first set of intensities and exposure times and the second set of intensities and exposure times are selected such that the first thickness is different than the second thickness, thereby printing at least a portion of the 3D object.