In the spirit of Alin's Power challenges, I have one of my own, only because I recently needed to model this and could not find a good (efficient) way to do it. Given recent forum conversation on Patterning, this is something that should be easy to do, but I find it difficult, and maybe impossible to do with patterning (at least in SW2017.)  See below;  this is a 15x15x.375" block. I want to pattern a 1/4" DIA ball cut out from the center and radially pattern it by 16X . the stickler is that I want each cut to stop short of the perimeter by /34" and have a ball end.  A bonus would be able got vary the radial pattern. I try to do this with "vary sketch" but could not. Below is my solution but it is not very efficient.  Okay SW guru's - prove me wrong and show me how to easily pattern this... :-)