The seeder is built from low-cost materials - mostly PVC pipe and bamboo. And, if you have them, you can use power tools to make it, but hand tools, including a machete, will work fine, too.
A team from Drexel University in Philadelphia, Pennsylvania is developing the seeder with rice farmers in Bo Klua, a community in rural Thailand. They've partnered with a local Thai organization called the Sustainable Development Research Foundation and produced a construction guide in English and Thai.
Both versions are available for free download.
Alex Moseson, a sustainable development engineer and an assistant teaching professor at Drexel who heads the project, has asked Instructables and E4C users for ideas and tips on how to improve it. He would also like to see people modify the design to suit their own farming and gardening needs.
As such, Moseson gave the seeder a Creative Commons Attribution-Non-Commercial license.
For more on the seeder and the project in Bo Klua, please see the Drexel team's site.
Step 1: Materials
Handle: PVC or bamboo
Slide pipe: PVC
Diverter: Wood or bamboo
Spear: Metal rod
Funnel: Wood or bamboo
Chute: Sheet metal
Slant chute block: Wood or bamboo
Flat Chute block: Wood or bamboo
Reinforcement ring: PVC
Pencil or marker
Sheet metal shears
Vice, angle grinder, power drill and a machete
Step 2: What it looks like
Now to make the parts...