[techhelpbb]

I personally have 3 3D printers.

Something I constructed with high accuracy linear actuators and an extruder I designed.

SoliDoodle 2

Up!

SoliDoodle printers with the heated beds are cheap and very RepRap like, but be prepared odds are high you'll be messing around to get them working.

My Up! printer on the other hand works very well and has always worked very well though it's object size is relatively limited.

I am not clear on the durability of the print but the resolution of stereolithography is better than what most of these printers offer. Though the working area is really quite small take a look at the Form1.

The issue you are most likely to have with a 12"x12" work bed is warping. If you try this I encourage you to enclose the unit in something to retain the ambient air temperature around the print.

You may not need such a large work bed, nor the probability of a very long print time, and the risk of ruining it late in the print if you slice and divide your models carefully.