Add Bluetooth to an old phone.
Build a Wooden Mini Yacht this weekend.
Combine custom molded earplugs with in-ear headphones for isolated hi-fi.
Import a CAD part file into an assembly file in Alibre Design.
Connect your smartphone to your car's cruise control.
Drill patterns into hard-shell gourds and let the light in.
Power a car with laser-cut wheels using a torsion spring.
Gears are easy to make and use.
Biodiesel is vegetable oil (often used) that’s been chemically converted into a fuel thin enough to spray through a diesel fuel-injection system. No special equipment is needed to “cook” a small batch of biodiesel that will work in any diesel engine, from a model airplane to the family car.
Home made Gasifier ,produce gas from wood chips. and send to modify gas engine for Generate electric power.
Create stencils using items you have lying around.
Turn good vintage speakers into great modern ones.