Building Microfluidics Devices Biomedical engineer Michelle Khine uses Shrinky Dinks straight from the toy store to build microfluidic devices. by Elizabeth Svoboda August 18, 2009 Khine holds up a Shrinky Dink sheet on which she has printed several designs. She uses an ordinary laser printer to reproduce the patterns. Placed inside a toaster oven, a square of Shrinky Dink material shrivels as it heats up. The ink particles clump, creating ridges on the plastic. The miniaturized square will act as a mold for microfluidic chips made of polymer. Khine peels a polymer microfluidic device from its Shrinky Dink mold. Khine can also fabricate 3-D chips by melting etched Shrinky Dinks together.