Poster holder hex shape

Hexagonal poster holder, for that futuristic look.
After printing slide a ruler or credit card through the slit to free the ball.
When mounting make sure the ball falls down so it can wedge between the poster paper and the back of the mount.
If you are having trouble getting it to grip you can lift out the bottom part of the mount a little bit away from the wall, so the ball falls a little lower and is jammed tight when you let go of the mount.
I used putty for adhesive on the wall.
Let me know if you want a version with holes for nails or pins.