> Point taken, Scott. Is this sketch good enough?

Yes that's much better. The section view attached shows the minimum 
number of dimensions needed to fully constrain this shape (the CAD 
software will give an error if you try to overconstrain the layout).

A word of warning about getting it 3D printed, you will want to make 
sure that the surface finish is smooth enough, otherwise I imagine 
you're going to get bits of sausage meat stuck in the plastic which will 
probably be very difficult to clean out. Also I don't know what sort of 
pressures you're talking about, but some of the cheaper 3D printers 
don't give parts that are very strong at all. And, check the material 
used, as some absorb water very readily, expand and will change shape or 
warp over time.

Personally I would get this part turned on a lathe from a bit of 
stainless steel bar. It will last forever, be much stronger and far more 
hygenic. I doubt the price would be any more than a decent quality 3D 
print. The CAD software tells me it would weigh about 200g if made from 
steel.

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Attachments:
Download 'prt0001_stl.zip' (104 KB) Download 'section.png' (13 KB) Download 'solid.png' (116 KB) Download 'stl_mesh.png' (225 KB)

Preview of image 'section.png'

Preview of image 'solid.png'

Preview of image 'stl_mesh.png'