I know there is already a flyswatter here ( http://www.thingiverse.com/thing:9518 )
It's a little prettier than this but I was interested in making a parametric one so that it was adjustable.
So, here it is.
You can adjust the size, thickness, hole size and spacing and the size of the stick.
7/8/11 Uploaded thinner version (1.25 mm)
You may want to turn reversal off (at least with 1.75 mm filament). I found that the ridiculous amount of reversals that were taking place were fatiguing the filament and causing it to snap (or strip sometimes).
It doesn't seem like the reversal is necessary anyway because there aren't that many traversals necessary.