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Sharing knowledge to build rich, sustainable lives.

Appropedia is for collaborative solutions
in sustainability, appropriate technology, poverty reduction, and permaculture.

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your site to find, co-create and improve the solutions we need. Our vision and mission.

Contributors have made 345,991 edits and uploaded 27,518 files.
Browse our categories or all 7,426 articles.

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Aprologo-old.png As we approach our ten-year anniversary, we are looking at how best to support Appropedia in the next ten years. Please share your thoughts with us on the idea of appointing an Executive Director.


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Dremelfuge
Open source 3-D printing of OSAT. There have been a number of open source 3D printers, such as the RepRap developed. The basic idea for this project is to use them as tools to create OSAT in the field to help the goals of sustainable development. Prices on 3D printers are dropping rapidly.

An example of how these 3D printers can be used to meet these goals is the DremelFuge. The Dremelfuge is brilliant Open Source Hardware project developed by Cathal Garvey in Ireland. The DremelFuge is a printable rotor for centrifuging standard microcentrifuge tubes and miniprep columns. It is at least 10 times less expensive than a standard centrifuge and can be used by field workers in doing things like blood tests, but also by DYI biologists and educators. It requires industry standard 1.5ml/2ml Eppendorf/Microcentrifuge tubes.

  • Used with a drill at 3000 RPM, the Dremelfuge will deliver over 400g, enough to comfortably spin down Miniprep samples (proven personally). It will likely achieve acceptable results at lower speeds, too.
  • Used at 10krpm, on a Rotary tool for instance, a Dremelfuge should deliver over 4400g, more than enough to spin down bacterial cells.
  • At 16krpm, Dremelfuge matches commercial centrifuges.
  • On a Dremel 300, a maximum speed of 33krpm equates to a force of over 50,000 times earth's gravity, which puts it into so-called "Ultracentrifuge" territory. The latest version (as printed by Shapeways) has successfully spun tubes at this speed.
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Ecological dry toilets at Pedregal

Ecological dry toilets at Pedregal, a Permaculture Demonstration Center in Oaxaca, Mexico.

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Community action news

Obertrumersee1.jpg
Dec 9 Austria: ‘More green instead of grey’ is the new Salzburg motto [1]

Dec 9 India: to hold 1GW solar tender for government rooftops [2]

Dec 8 Food USA: Seed Libraries And The Law - Organic Gardening [3]

Dec 7 Pollution: Paris makes public transport free for second day [4]

Dec 3 Light of Hope in the Middle of the Crisis: Solar Power to Light Up Syrian Refugee Camp in Jordan [5]

Read More...


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Tim Jarvis on his Antasrtic expedition
Thinking is good, but doing is better.

Tim JarvisW
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Hot topics / In the news

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Blog

The Vitruvian Man is a world-renowned drawing created by Leonardo da Vinci circa 1487.
Those who have health have hope, and those who have hope have everything.
Arabian Proverb

An individuals health greatly influences their ability to support themselves, provide for their family, and contribute to the community. Because of this, access to care and the health of a community is central to any development effort.

Unfortunately, health care is poorly distributed around the world. Southern hemisphere countries are much more likely to suffer from lack of access to care. One aspect of this disparity is the health technology gap between developed and developing nations. While developed countries continue to invest in high technology equipment, developing countries often lack the most basic health care tools. Appropriate Medical Technologies (AMT's) can help communities, governments and development agencies create simple, low-cost, and culturally appropriate responses to health care problems.

The use of appropriate technologies is less common in healthcare than other fields such as construction or agriculture. However, there is significant crossover between the public health field and the water and sanitation fields, areas that are more familiar with appropriate technologies. Appropriate technology is often used to develop mobility and rehabilitation equipment as well as tests used to diagnose diseases.

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Engr305 Appropriate Technology Projects: Below are selected service learning projects from Engr305 Appropriate Technology, which is a course on appropriate technology at Humboldt State University taught by instructor Lonny Grafman.

CCAT Clay-straw slip wall

Clay-straw slip wall of CCAT's Greenshed  
CCAT clothes drying

Efficient clothes drying system for CCAT  
CCAT Cold Box

An energy efficient solution to a refrigerator  
CCAT Compost System

CCAT's comprehensive composting system  
CCAT greenhouse natural wall

An aesthetically pleasing natural earthen wall built by clay and straw slip methods  
CCAT greenshed cob wall

Cob wall of CCAT's Greenshed  
CCAT greenshed north wall

Cordwood and mortar wall of CCAT's Greenshed  
CCAT greenshed west wall

Clay-straw slip wall of CCAT's Greenshed  
CCAT greywater marsh (2008)

CCAT's Greywater Marsh 2008  
CCAT greywater marsh (current)

CCAT Greywater Marsh Continued  
CCAT interpretive wind turbine display

Demonstration wind turbine  
CCAT's living roof

Replacing CCAT's living roof  
CCAT MEOW 2012

Refurbishment of CCAT's Mobile Energy Operation Wagon  
CCAT natural concrete stain

Natural concrete stain  
CCAT natural paint project

Interior paints from natural ingredients  
CCAT natural wall construction

Earthen informational kiosk for CCAT  
CCAT pedal powered grain mill

Pedal powered grain mill for CCAT  
CCAT pedal powered TV

Updated version of CCAT pedal powered bicycle  
CCAT rainwater catchment system

CCAT's current rainwater catchment system  
CCAT Raised Garden Beds

Controlled beds of soil above toxic ground  
CCAT remediation zone

A stable slope for planting and attracting beneficial insects  
CCAT Retaining Wall

Retaining wall for slope erosion at CCAT  
CCAT rocket stove

CCAT's improved fuel rocket stove  
CCAT small rainwater catchment

Rainwater catchment for CCAT's cob bench roof  
CCAT's Vermicomposting Bin

CCAT's vermicomposting bin  
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Energy

Solar
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New pages being developed:
  1. Oven Stove Adjustment Knob
  2. Viability of Distributed Manufacturing of Bicycle Components with 3-D Printing: CEN Standardized Polylactic Acid Pedal Testing
  3. Mason jar analysis
  4. 3D Printed Gravity Light
  5. Athena Heated Print Bed
  6. Quick-carrying-handle
  7. Open source malaria
  8. Kijenzi Printer
  9. Raspberry Pi Control and Wireless Interface
  10. Aid For Tying Fish Hooks

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