I think it would be great to have a printable Dalek with a movable eyestalk, ray gun, and suction cup arm, and rotatable head.  I’m working on building such an animal.  I see the small eyestalk, gun, and arm to be the big challenges here.

I’ve got a reasonably rotatable head – by lopping off the head from the digital design files, adding a little stump, and putting a hole into the Dalek.  More as this progresses.

Plus, since I’ve recently really improved my print quality (and increased print time!) I’m looking forward to re-printing this thing.