About this 3D model

I developed some microwells for use in my day job ( http://tinyurl.com/6bm6bth if anyone's interested), and when I am e.g. presenting a poster it's useful to have some examples to show people what I am working on. I made this demo case a couple of years back to hold them and keep dust out etc. I am posting it here as someone asked about strategies for fitting parts together - in this case I have tapered the interface between the two parts (look closely at the join between the wide and narrow sections of the insert, and the corresponding surfaces on the case), and it clicks together nicely. IIRC I put either 0.5 or 1.0 mm allowance in the direction of travel ( not normal to the surface), which has worked out perfectly and allowed for wear over the last couple of years. The nice thing about this strategy is that you slide it in until it fits right, so as long as you can handle a bit of +/- in the one axis, it's very tolerant of imperfections in the print. Probably zero allowance would have been OK hot off the printer, but after many cycles of opening and closing it has worn down a bit - it still works perfectly, but only because I left that allowance. It was printed on a Stratasys Dimension printer.