So here are the 3d parts needed to create an Acrylic or Polycarbonate (for higher temp resistance) print area enclosure. I wanted an enclosure which can keep the heat in for ABS printing, keep dust out and as much of the electronics out. I also wanted this to be doable by all enthusiasts not just once with garages and powerful tools.
Yes it's easy and much easier to put the whole thing in a box but for me keeping the electronics cool is very important as it ensures good performance. Plus it looks cool.
For a full set of instructions on how to assemble and what you need please head over to: http://www.gi-architects.co.uk/2015/12/prusa-i3-print-encloser/.
It was just too much to put all in here.
Update 1: I have included the 123dx file and a step(.stp) export.
You only need supports if the screw holes don't come out correctly. I would suggest that you print 4 objects at a time (same type), it's what i did and come out perfectly fine. You can use slicer to split them.
I did have to enlarge the holes a tiny bit after printing as i used ABS which tends to shrink a tiny bit (the drawings are exact for m3 bolts). Other than that i sanded them a tiny bit and painted them.
The upper left part holding the back enclosure has a flat surface where you can glue or drill and anchor the screen.