> I don't understand how a union of these objects will remove the sharp
corner
> that lies along the z axis. It seems to me that a union will simply result
> in two (why two?) boxes with 4 cylinders (lying along the z axis) simply
> buried in the boxes. An explanation would certainly help this newbie.
> Thanks.

Try this:

  union{
    box{<-2,0,-1> <2,1,1>}
    box{<-1,0,-2> <1,1,2>}
    cylinder{0 y 1 translate <1,0,1>}
    cylinder{0 y 1 translate <1,0,-1>}
    cylinder{0 y 1 translate <-1,0,1>}
    cylinder{0 y 1 translate <-1,0,-1>}
  }

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