You only need three materials: If you're repurposing an old trash can, thoroughly rinse it. You don't want any lingering remnants of non-biodegradable materials in your DIY compost bin.

[Minnear Knives] had a bunch of apricot stones in his compost pile, and it was the pits. He did some research and decided to build his own rotary trommel to tumble out the trash. As you will see ...