Steve and all others.
 Void free center pads are achievable but you have to really think out of
the box to arrive at a solution. I have worked with parts 1.6mm square to
parts as large as a postage stamp and the same basic techniques work. 

Helpful hints;
Solder mask is your enemy and the proper aperture will look very different
than what you usually see. 
 Little blocks of solder paste will only result in voids.  
Think out of the box.

Due to my work I really cannot reveal the secrets but the results can be
achieve.

John 

 On Wed, 7 Aug 2013 14:12:02 -0600, Steve Gregory <[log in to unmask]>
wrote:
> (background chorus) I want my...I want my...parts void free!
> 
> Steve
> 
> 
> -----Original Message-----
> From: TechNet [mailto:[log in to unmask]] On Behalf Of Whittaker, Dewey
> (EHCOE)
> Sent: Wednesday, August 7, 2013 1:47 PM
> To: [log in to unmask]
> Subject: Re: [TN] QFN solder voiding
> 
> Striking a familiar chord; Excellent! 
> Dewey
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