What it is: The Renegade pen is a $99 3D printing pen currently raising funds onKickstarter that uses recycled household plastic (think bags, plastic bottles and files) as well as standard plastic filaments. Daniel Edwards created Renegade to help cut down on plastic waste and decrease the barriers to 3D prototyping for mainstream users.

Why it's important: This design makes it cheaper and easier for enthusiasts and amateurs to try their hand at 3D prototyping and additive manufacturing, with the added benefit of reducing household plastic waste. 

Spotted by Marissa Brassfield