CAD
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Paper changes size with humidity, temperature, pressure from the printhead
(deformation), and age. Mylar, or acetate, tends to stay the same size under a
wide range of conditions, and so is a prefferred media for drawings that have
mechanical requirements. Ink jets might also work. The problem here is that
both acetate and mylar are too stiff, and often to thick to be successfully
used with a 'normal' printer mechanism. –Ben–