covid19 prusa rc32 8pcs stacked 3 hole punch
thingiverse
This is a modification of the Prusa rc3 face shield. The punch holes are the use standard the hole punch. The stack is spaced 0.3mm. So recommended layer height is 0.3mm. "In regions that use the US Letter paper format (8 1⁄2 by 11 inches, 220 by 280 mm); United States, Canada, and in part Mexico and the Philippines), a three-hole standard is widely used. The holes are positioned symmetrically, with the centers 4 1⁄4 inches (108 mm) apart."- Wikipedia.
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