Done with blender and colorcorreted/composited in Photoshop
For the base I used Dunsti’s trumpet form blendswap http://www.blendswap.com/blends/musical-instruments/trumpet/
I used booleans to slice the parts and modelled some new parts I made valves to animate if so when piston is pushed down spring and everything moves accordingly.
I rendered only 100 passes as I have found out that noise after 60-80 passes won’t show on print
http://dl.dropbox.com/u/39642124/trumpetti_angled5.jpg
http://dl.dropbox.com/u/39642124/trumpetti_angled6.jpg