New Rules on PCBFABExpress: (last updated May 2013)

Hole Density:

• If hole density exceeds 50 holes/sq inch but is less than 75 holes/sq inch then we may charge $50 extra for the order.
• If hole density is > 75 holes/sq inch then we may get you a custom quote.
  
  

D2C:

• On any layer, the Drill to Copper distances must be 10 mils minimum.
• In other words, the distance from the edge of any hole to the nearest separate copper feature must be atleast 10 mils.