Hologram Viewer Lens Shoe 3x3 cm for Tablet or Laptop

Greetings!
This small print acts as a shoe for the hologram kits for tablets or laptops as described on Youtube. The smallest opening should be 3 cm x 3 cm.
Instructions to construct hologram viewer:
Take 4 cd case clear plastic covers. With an exacto knife, cut a trapezoid from each cover.
The dimensions are: base = 12 cm, height = 7 cm tall, and 3 cm along the top.
Glue or tape the sloped edges together. The 3x3cm square hole at the top of the will fit neatly into this well-printed shoe.