3D printer some study and information in net

some blog
RepRep -- http://reprap.org/wiki/RepRap
3D印表機DIY分享-- http://blog.xuite.net/diy3dp/main/198689436
Ming's Blogger -- Engineering  http://ming-shian.blogspot.tw/
3D印表機 DIY 建構筆記 -- http://diy3dprint.blogspot.tw/
A UK site http://www.nextdayreprap.co.uk/