Microdevices with complex three-dimensional (3D) internal and external structures are described. The microdevices are made by a method combining micromolding and soft lithography with an aligned sintering process. The microfabrication method, termed StampEd Assembly of polymer Layers (SEAL), generates microdevices with complex geometries and with fully-enclosed internal cavities containing a solid or liquid. The microdevices are useful for biomedical, electromechanical, energy and environmental applications.
