We use both, it's just a matter of what you get used to, which you prefer, I can say for me,positive tend to be more toward what you see is what you get, where with negative, you might find you need to look at the art work you created for fab. From: icu-pcb-forum-bounce@xxxxxxxxxxxxx [mailto:icu-pcb-forum-bounce@xxxxxxxxxxxxx] On Behalf Of Ali Sent: Thursday, October 21, 2010 9:12 PM To: icu-pcb-forum@xxxxxxxxxxxxx Subject: [PCB_FORUM] Negative n Positive Shape Hi Group, We are looking to use positive shape instead of negative. Does any body has idea on the consequence of using negative shape vs positive shapes? Thanks in advance.