Susumu-san designed and published a great template for making a heart-shaped cardboard nose flute, and gently authorized us to post it here. You can download the PDF file here for printing the Kamihanabue ('Paper nose flute').
1.- First, you obviously need to cut the pieces:
2.- Then, mark and fold the bottom part following the mediant line:
3.- This is the most tricky part, yet very easy: you have now to mark the lines, and 'valley fold' (concave folding) what will become the nose rest, then the little top of it:
4.- finally, mark and fold the top part:
5.- Both parts are ready to be glued together, and that's it!
Here is the nice paper nose flute you obtain. The cool innovation and great feature is the little origami that creates a real nose saddle.
I made the five ones, and sprayed them with paint, not only for aesthetics, but also to get the flutes more rigid and waterproof.
Check here for the version #2 Mr. Yasuda made later!