Custom-engineered components molded from engineering plastics for precise photonics applications are available from Matrix Inc. Included are optical subassemblies that have integral lenses and microlens arrays with 250-µm centers. Depending on size and material, the components can incorporate holes of <250 µm, threads, custom finishes and inserts. They offer a concentricity of <15 µm and positional tolerance of >3 µm. They range in diameter from <3 x <4 mm down to 125 µm, with walls as thin as 0.5 mm.