Thanks.   I should add that they want the solder mask to be positive (ie 
the solder mask clearance is supposed to be 0.4mm), so your cunning idea 
can't be applied in this case.

Regards,

Robert.

axtz4 wrote:
> --- In [email protected], Robert <birmingham_spi...@...> wrote:
>> Hi all,
>>
>> I've been asked to shrink the size of the solder paste windows relative 
>> to the pads by 0.04mm, ie if a pad is a 1mm diameter circle, I've been 
>> asked to make the solder paste window 0.96mm in diameter.   Does anyone 
>> know how I might achieve this please, either with kicad or via some 
>> post-processing stage?
> 
> In the board editor, select the menu Dimensions | Tracks and Vias. From that 
> dialog, you can set the global mask clearance. A negative clearance does seem 
> to work okay, though a verification pass through a Gerber viewer is always a 
> good idea ...
> 
> 
> 
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