You can use the box as is to create a planter that's the same shape, or you can cut the cardboard into various shapes and designs and tape them together to make a bespoke concrete mold.

Place an old bucket or plastic bowl covered in cling wrap on top to act as your mold -- this will determine the shape and diameter of your planter. Keep in mind that your towel and concrete will ...

[Thomas Sanladerer] wanted to create some molds using 3D printing for concrete and plaster. He used a delta printer with flexible filament and documented his process in the video below. If you ...