SEE: Home 3D printers take us on a maddening journey into another dimension | Ars Technica
Had a good laugh at this older article as I have been caught up in the DYI 3d printing. The author paints a good picture of all of the frustrations of tweeking a printer (i.e. Materia 101) and the premise of not ready for prime time.
I tried printing his designed coaster, but it would not behave as written. If you are in this stage of experimentation you will understand "Been there, done that."