I love this shelf -- simple, useful, elegant!
I made a pdf with word instructions and a crease pattern. I also included photos to show how to form the shelf. My version has no visible extraneous creases. Click on Files at bottom of this page to download the pdf.
8.5 in. (21.5cm) square gives a shelf that is 7 x 5, holds 2 inch models
12 inch (30cm) square give a 9 x 7 shelf, holds 3 inch models
Recommend printer paper, scrapbook paper, or cover stock for the weight.
Attach shelf to a wall or bulletin board with a thumb tack or push pin.
Time permitting: variation from 8.5” x 11” printer paper or A4 paper