Mold for processing of materials

A mold assembly for processing a material, the mold assembly comprising:

• a body having a top surface and a bottom surface, the body comprising a mold outer body and only one mold insert, the mold insert comprising:
• a void within the body configured to receive a porogen and a piece of thermoplastic material, the void centrally located within the mold assembly and extending in a top to bottom direction to form a non-through cavity with a cavity surface that is substantially planar and parallel to the bottom surface of the body, wherein the material after being processed is planar;
• and
• a protrusion on the body extending from the cavity surface towards the top surface, wherein the void extends at least halfway through the body towards the bottom surface;
• and a peg disposed on the body and shaped to matingly engage a weight via a hole within the weight, and
• a static weight configured to be placed on the piece of thermoplastic material in the void of the mold insert to press the piece of thermoplastic material onto the porogen.