FOR years, every time i machined wood in my shop – sawing, planing, sanding – my open-base cabinets and wall-hung shelving units became dust depositories. Emptying the contents of these to clean them out was a chore I never looked forward to, and yet, if I didn’t do it, smaller items would get buried in layers of dust, making them impossible to find. I didn’t want to make doors of varying sizes to enclose the units; I needed something quick and simple.