Printrbot is well known for its low cost plywood printers. Over at Makezine there is a news that they are releasing the first full metal body machine, the metal Simple. It has larger print volume of 6″x 6″x 6″, Z-axis end-stop adjustment knob and a self-leveling bed. It looks good, and should be very sturdy.
http://printrbot.com/
Source:
http://makezine.com/2014/02/11/first-look-printrbot-unveils-its-all-metal-3d-printer/
http://printrbot.com/
Source:
http://makezine.com/2014/02/11/first-look-printrbot-unveils-its-all-metal-3d-printer/