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Poured Block Molds

Block Molds

The most basic type of mold is the poured block mold. In this first tutorial we explain the planning and rubber selection process of a seamless block mold In this tutorial we use 71-10 to create a fast, stretchy, 1 piece mold.

Veneer stone is typically cast from a block mold. For large molds for concrete, urethane rubber is preferable as it has a much higher abrasion resistance than silicone. In this tutorial we explain how to make a master mold for reproducing veneer stone molds for mass production.

Some resin parts may require multi-piece molds or molds with vents and sprues to allow for better flow of EasyFlo or 1512 resin through the mold.

In this two part tutorial we show how a 3D print is broken down into sections and molded in three PlatSil 73-25 molds all cast in EasyFlo resin.



When casting thin parts in EasyFlo Resin, vents are crucial to achieving consistent, bubble-free parts. In this tutorial we address venting of complicated parts using TinSil 80-15 silicone and EasyFlo resin.

2 Piece molds may also be created using the block mold method. In this tutorial we make a 2 part mold of a model car body. To make a fast mold that would hold up well in production, we used PlatSil Gel-25 for our silicone mold rubber. 2350 was used as a release.

Molding & Casting Scale Model Parts

In this video we use PlatSil 73-15 silicone to make a block mold of a model airplane propeller. We released the original part with 2500 spray release and cast it up in EasyFlo 60 casting resin.