STEPHEN, UNLESS YOU REALLY NEED TO DO ODD LAYERS, DON'T DO IT. IT WILL COST THE SAME IF NOT MORE THAN THE NEXT EVEN LAYER COUNT DESIGN. UNLESS YOU'RE VERY CAREFUL WITH YOUR COPPER BALANCE AND LAYOUT YOUR BOARD CAN COME OUT LOOKING LIKE A POTATO CHIP AFTER ITS BEEN LAMINATED. WAY BACK WHEN I WAS FIRST DESIGNING I DID AN ODD LAYER COUNT BOARD AND I'VE NEVER DONE ONE AGAIN. IT WAS ABOUT 6 INCHES LONG AND 3.25 WIDE. WHEN RESTED ON A FLAT SURFACE THE CORNERS WERE ABOUT 3/16 OF AND INCH FROM ABOVE THE SURFACE. I TRIED TELLING THEM IT WAS A FLEX CIRCUIT BUT, NO ONE WAS BUYING IT.... REGARDS ROB BUTTERWORTH ADC VIDEO SYSTEMS WALLINGFORD, CT [log in to unmask] ______________________________ Reply Separator _________________________________ Subject: FAB : Odd Layer PCB's Author: [log in to unmask] at internet-mail Date: 6/27/96 1:14 AM Dear TechNet, Can anyone give me pro's and con's for designing Odd number of Layer PCB's i.e. 3 and 5 layer boards Stephen Cooper Manufacturing Projects Manager SCITEC LIMITED Apollo Place Lane Cove NSW 2066 Australia Phone : +612 428 9500 Fax : +612 428 9589 Email : [log in to unmask] Website : http://www.scitec.com.au