I started building a Prusa i3 last weekend. This is the printer that my students are building (thus the DCRL engraving). It's a very cool design with minimal printed parts. It breaks apart easily to become mobile. I was able to stuff it in my messenger bag and take it to work on the motorcycle the other day. I decided to go with an acrylic frame in place of wood or aluminum. I just got our laser cutter installed at the DCRL so the students should be able to cut their frame with it. I will be making an aluminum y axis carriage to replace the acrylic one I cut. I also decided to use the y axis bearing mount/carriage mount from the mendel 90. I think this should make a pretty cool printer. I'm waiting on 5mm rod for the z axis and I'll have to decided on an extruder type.