Its an amazing video from Cosmas Bauer. First of all, many people do not know what a cyclone dust extraction system actually is, and second you can see how easy is to make one! And you can save energy, time and of course vacuum bags!
Building a baffeled cyclone that can be used with a shop vac or even a standard vacuum cleaner to use it as a shop vac or save on filter bags. The cyclone unit cost around 15 euros to build, bucket included.