Excellent site for DIY machines with free open source plans. Here are three practical machines that caught my attention:
Self Contained Mobile Biodiesel Processing Trailer
“The farm based self-contained mobile biodiesel plant constructed by GreenStart is based on a common aluminum beverage trailer platform. The heat and power is provided by a 3 phase diesel generator coupled with a 10hp air compressor. Each functional component is designed to fit the standard beverage skid of 36″ square which enables swapping of components. The shutter sides provide secure weatherproof environment for storage and transport. The low deck height also facilitates operation and maintenance from the ground level.”
http://farmhack.net/tools/self-contained-mobile-biodiesel-processing-trailer
Commercial Scale Rocket Oven
“A fuel efficient, low cost, biomass fueled 24 loaf baking oven. Combustion technology is based on the rocket stove design, which uses an insulated flue and efficient combustion chamber to achieve high levels of fuel efficiency and low emissions.”
http://farmhack.net/tools/commercial-scale-rocket-oven
Water Filter Biochar Generation System
“Fabricating a 200 L Biomass Gasifier for Making Enhanced Water Filter Biochar: The basics of biomass gasification: a low-cost, user-friendly and environmentally sustainable method for making good water filter char from agricultural and forestry residues. Open access handbook available from Aqueous Solutions.”
http://farmhack.net/tools/water-filter-biochar-generation-system
Much more at Farm Hack.net
It’s amazing how many things you can find for free on the Internet. Let us know if you build something.