Draw your strip of 9 triangles (with 6o degree corners).
Cut out the strip of 9 triangles
and then fold backwards and forwards
along each of the lines
(so they can bend either way easily).
Then fold up to make the hexagon (as in the video).
Tape the open top edge.
Draw on your designs, turning your hexagon inside-out
to get to the third side (as in the video)