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Nice post and great idea. If you metric folks (yes, a lot of us in the US know you are superior) want something more useful than 382 um business cards then try 3M brand post-it notes (yellow sticky notes). They average 100 um and are remarkably uniform throughout the pad. It's been awhile since I was using them a lot but I think it was less than 5 um variation between sheets. I used to know the inventor and he told me that precise control of the manufacturing process was a key piece of the secret sauce.
A better vacuum chamber
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