Abstract: Described herein are stereolithographic methods for preparing 3D objects comprising hollow regions and/or multiple materials. In certain embodiments, the methods comprise applying a blocking composition to fill hollow regions in the 3D printed object. In certain embodiments, an absorbent is applied to dispense material into the 3D printed objects and to remove unwanted resin from the hollow regions. Additionally, in certain embodiments, the modular stereolithographic apparatuses described herein contain an invertible, double vat, which enables users easy access to multiple materials throughout the 3D printing process.

Abstract: A method and device of polymerization to form 3D objects is provided. The method and device incorporate an inert immiscible liquid between a liquid monomer and a light source such that the liquid monomer is polymerized when exposed to polymerization light from the light source at a liquid monomer-inert immiscible liquid interface. The liquid monomer is polymerized into a solid polymer that forms the 3D object.

Abstract: Provided herein is an improved device and method of manufacturing multi-materials 3D objects. The improved device and method inject liquid monomer through a porous substrate to the desired locations along the substrate. The liquid monomer is polymerized by exposure to light to form a solid polymer. Different liquid monomers can be sequentially injected into through the porous substrate to the desired locations along the substrate for formation of 3D objects formed of different polymers.