3/22/2014 Update :: Removed Cap with tapered nozzle -- that, as was pointed out, was another source of turbulence. I have uploaded instead a very much working 20mm nozzle with straight sides. That is the cap shown in yellow with the nice flow in the latest photos. Thanks to everyone for the tips and discussion and keeping this going.

I was inspired by this video: https://www.youtube.com/watch?v=Ijn98G0I99E video.

Laminar flow also has a wiki entry: http://en.wikipedia.org/wiki/Laminar_flow

It seemed like a good project to attempt to design and 3d print. Simple but with several threaded pieces that were mostly a challenge to design -- they printed REALLY well. This all screwed together with ease.

I am hoping that others will print and refine this model -- it works, but I am sure it could work even better. I would like to eventually make an illuminated one.

You need to print:
1 cap ( .3 layers 60% infill 3 perimeters)
1 Tube ( .3 layers 60% infill 3 perimeters)
1 Bottom Cap with GHT (.3 layers 60% infill 3 perimeters)
2 baffles (no top/bottom solids, 20% infill. 5 Perimeters)

I plan to print just the rings for the baffle and use a piece of commercial nylon screen I think instead -- the whole idea is to reduce turbulence and my baffle seems like it creates it. I think a finer screen will result in a better stream.

I used ZenToolworks ABS (Clear/transparent) for the majority of the design (all the white/translucent pieces) and ZenToolworks yellow ABS for some of the later caps.