This is the finished DIY 3D printer from Thinh Lavith. Its the result of a 5-months hard work after making another wooden prototype, which proved to be very flexible having a wooden frame. This one is made of 7075 aircraft aluminum and its based on the Prusa i3 (the current 3D Printer design by RepRap Core Developer Prusajr), and some other popular 3D printer designs such as Aluminatus TrinityOne, MendelMAX v2, Lulzbot TAZ etc. This design though utilizes thrust bearing design for the Z-axis movement, improving therefore the print quality and Z step. Most of the parts on this design are CNC-machined by himself. Its a 10/10 from me.
Lavith offers the SolidWorks source file of his design just to get the idea, make your own of make a better one (why not?).