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.
Use the label as a built-in resist!
Use a 555 timer to make an LED blink like the one in a security camera.
A lightwire animation project.
Easily program your 3D models instead of sculpting them!
Create disposable mold elements with scrap styrofoam.
Build a 5-foot-wide airplane inspired by 1930s designs.