There are two kinds of personal 3D printer owners these days: those who like to build the printer from a kit and those who'd rather pay more for an assembled version.
If you're one of the former, you'll be interested to know that MAKE Magazine is running a series of detailed posts describing their experience in building MakerGear's Mosaic 3D printer kit. The series, written by Sean Michael Regan, includes seven episodes: The frame, The X, Y and Z axes, The extruder, The Platform and The Electronics.
As all MAKE Projects, this one is very detailed with plenty of step-by-step instructions, images, parts lists and tool requirements. Easy!