Evil Mad Scientist, makers of Axidraw pen plotter acquired by Bantam Tools
bantamtools.com
bantamtools.com
Perhaps there are competitors there now, but would love to see a hobbyist level machine with the convenience of 3d printers. I spent too much time with my plotter doing things like formatting svg's or manually homing the machine.
I believe the new Axidraw (teased on the Bantam Tools website and called the Nextdraw) has better honing capabilities. Seeing as how Bantam tools specialized in CNC mills, I suspect we'll see further improvements too.