Modified the model below to make the nozzle transition smoother so that there's less head loss.
http://www.thingiverse.com/thing:45286
An unintended effect was that it made it a lot easier to print since supports are no longer needed!
The inner diameter is 2.047". I've attached the Solidworks file (2013) in case you want to modify it.
| HAIR_DRIER_NOZZLE.SLDPRT | 284.5KB | |
| HAIR_DRIER_NOZZLE.STL | 259.9KB |
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