Abstract: In an improved method and apparatus for investment casting, a pattern (31) is mounted on a sprue base (19) of an spider gasket (12) that is secured to one end of a standard investment flask (11). A solid end cap (13) is secured to the other end of the flask. The end cap is provided with a matrix of holes (15) extending therethrough parallel to the axis of the flask, and a plurality of small diameter rods (16) are slidable secured in the holes in the end cap. The rods are extended into the interior of the flask about the pattern without contacting the pattern. Investment plaster (10) is poured into the flask through the spider assembly to immerse the pattern and rods, and the plaster is allowed to set. The rods are then withdrawn, forming a large plurality of channels (32) extending into or through the investment plaster, reducing the amount of investment plaster required in the flask. The channels greatly accelerate the drying time of the investment, and hasten the subsequent burnout process in a kiln.