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The Fold Flat Trebuchet on the Cheep
Have you tried that? I tried with a utility knife, and it didn't cut very far. I think the blade cools down too quickly, which is why you need a soldering iron.
How to Make a Marshmallow Gun or Marshmallow Shooter
How to build a treehouse
Splash-Pod: The Personal Water Park
Build a Baking Powder Submarine
Impossible Marble in Truncated Cube
Creating a DIY Puzzle Cube