A test piece for adjusting the laser power and traversing speed for a Shrinky Dink or double-sided tape microfluidic device. Has 4 separate channels of width 1500um, 1000um, 500um and 250um plus a 6mm x 6mm resevoir on each channel. Channel lengths -> 50mm. Designed in KiCAD PCB editor. For Shrinky Dink laser engraving with a visible laser I recommend making the surface of the plastic sheet black (e.g. use a permanent marker) for effective absorption.