i called expressPCB and they said they will send you the gerber files for a given project after you order boards from them.
i haven't tried this but maybe someone here can?
-=drew
Here's a reply I received from ExpressPCB on Gerber files:
You can order gerber files by email for PCBs that we have previously
manufactured. The cost of a gerber file order is $60. The $60 fee will be
billed to the credit card number used with the original order of boards.
To order gerber files, send email to
support@expresspcb.com with the exact
information listed below. The email MUST come from the person that placed
the original PCB order.
1) Write a note indicating that you would like to purchase gerber files.
2) Acknowledge in your email that you understand there is a $60 fee for
each set of gerber files that you order, and that the fee will be billed to
your credit card.
3) Specify the order number of the previously manufactured design by noting
our original 9 character order number. Our order numbers have the form
ABCD-1234-E.
We will generate the gerber files using the original PCB design file
associated with your order number. We will then email the gerber files
back to you as an attachment. The email will also include a receipt for
the $60 fee marked "Paid in full".
You will receive these files:
+ Top silkscreen layer
+ Top soldermask layer
+ Top copper layer
+ Bottom copper layer
+ Bottom soldermask layer
+ Drill file
+ 4 layer designs also include the 2 inner layers
Typically it takes one 24 hour business day to fulfill the order.
