Even more low cost wood frame Deltas on Instructables. This one is from user Braden Petno and can me made for less the 400 dollars. There are no 3d printed or CNC produced parts, so it is an advantage if you don't have access to them.
Detailed build instructions:
http://www.instructables.com/id/Deltatwister-The-Diy-Sub-400-3d-Printer-made-with-/?ALLSTEPS
Detailed build instructions:
http://www.instructables.com/id/Deltatwister-The-Diy-Sub-400-3d-Printer-made-with-/?ALLSTEPS
Here is QuadStrap, another low cost 3d printer with no printed plastic parts which also has extensive construction manual: