The more I use my reprap. The more impressed I am. The results are spot on and easily outstrip the speed and quality of manufacture that I could acheive machining the parts by hand (even if I had the machine tools to do so).
Here is the CAD drawing of the barrel holder/focus tube holder part of my gun model:
And here is the real thing as printed by reprap:
Assembled side on:
And the real thing:
From another angle: