For anyone using a 3 hole punch to make lenses, the mounting pins SHOULD NOT BE AT THE BASE OF THE FRAME. If the mounting pins are at the base, then there are 3 small crescent-shaped gaps that can allow liquids to get through your shield. This remix does two very important things. - The three mounting pins have been raised up 4mm from the bottom edge of the frame.  This keeps the entire hole in the lens up on the frame, preventing all gaps.  This version also keeps the left and right edges of the clear lens pulled back toward the frame.  This creates much more "wrap-around" of the lens when using standard 8.5" x 11" document covers.  This does require three small areas of support material under the mounting pins. We print 2-up on Prusa MK3's in 3 hours and 49 minutes.