This is the same file I have (And have today printed off), and although I have not started to make it yet, there seems to be a big problem regarding the curvature of the semicircular areas around the ear areas. The 3D model shows them curving inward at an angle of about 10°, and so have some 3-4 mm wide gaps where trianglular sections are cut out.
The problem is that the actual iunfolded model neither has cutouts, nor tabs, so there seems to be no way of curving it. How did you manage with this, because the outer ear part at least seems to be angled correctly? Thanks if you're able to help!