Here is a new simple and low cost machine project by Almus Yang. It has laser cut plywood frame and acrylic structural parts, it has no 3D printed parts. It can be sourced for some 200 USD on low cost parts sites like Alibaba.
Very detailed construction guide can be found at:
http://www.instructables.com/id/Building-a-3D-Printer-Under-200/
All the files on Thingiverse:
http://www.thingiverse.com/thing:797666
Very detailed construction guide can be found at:
http://www.instructables.com/id/Building-a-3D-Printer-Under-200/
All the files on Thingiverse:
http://www.thingiverse.com/thing:797666