How to I select an appropriate wall thickness?

I am trying to make a bracket to hold a very small (6 cm), to blow air down a tube (to dry out my bagpipes, actually). I don't know how strong the printed material is (and don't know how strong I need to the member to be....). 

I would like to press fit a gradually tapered cylinder into the inner bore of my bagpipe, but don't know what sort of wall thickness I ought to have. 

The fan is in a case that is a rectangular sold. I would like to "snap" it into a rectangular recepticle, but I don't know how elastic the printed polymer is, and how to design a "snap" fitting....

How do I learn about this type of stuff?


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