This is a modification of DtM-v3.0. 

If people are using a three hole punch to make clear lenses for this frame, then there are three small crescent shaped gaps under each pin.  We have learned that healthcare providers that do intubation need these gaps closed.  This modified version raises the threee mounting pins up 4mm.  It requires support material under the pins, but by controlling the support area, it only adds a couple of minutes to the print time. IT IS IMPORTANT to close those gaps.

This design uses a 7.0" x 0.125" rubber band as the strap. The addition of the four built in hooks makes it a bit more comfortable for different head sizes.