PVC air cannons are great, and everyone should build one of these at some point in their life, but what really makes this build exceptional is the valve. [Ben] created a piston valve for this ...

Hollow-core 'slabs' are 80 in. long and available from 28 to 36 in. wide. Cut the PVC to make legs and assemble the table as shown. And then check out our tips for finishing a table top.

And you can watch it in action in the video embedded below. Things we particularly like about this build include the PVC parallelogram movement, springs around tubes to push the Dremel head back ...

Giant scissors slice it to the correct length. To make branches that appear snow-tipped, this machine twists and then frosts the PVC needles with a spray of white, latex paint. They use this ring ...