Former EE, now I am a dentist. I make projects at home and at the Milwaukee Makerspace that are far more interesting than anything I ever got paid to do as an engineer.
My 3D printer, Son of MegaMax (SoM), was designed and built using everything I learned from building its predecessor, MegaMax. The goal was to push precision (and so print quality) and reliability as far as I could. SoM has linear guides, DSP drivers and 32V power supplies in the X and Y axes, The Y and Z axes are screw driven. All the electronics fit in a drawer at the base of the machine. It isn't a small, fast, or quiet printer, but print quality is superb.
Photos of MegaMax can be seen here: https://drive.google.com/folderview?id=0BxckS0Y4E9lzN1hlOGtaeUdZcUU&usp=sharing
Son of MegaMax can be seen here: http://www.instructables.com/id/An-Almost-Reliable-High-Precision-3D-Printer-Son-o/
I Am A…Maker
Tools I Use…
Printers: MegaMax- my own design and construction