Chih-Chieh, I would encourage you to look at commercial mask vendors as well. I don't know if it would actually come out to be cheaper or not, and it would depend on a variety of factors, but if you get optically printed masks on soda lime substrates, they aren't terribly expensive. Type "photomask" into google.com to pull up a list of vendors. David Nemeth Senior Engineer Sophia Wireless, Inc. 14225-C Sullyfield Circle Chantilly, VA 20151 -----Original Message----- From: mems-talk-bounces@memsnet.org [mailto:mems-talk-bounces@memsnet.org]On Behalf Of Chih-Chieh Cheng Sent: Friday, February 17, 2006 11:41 AM To: mems-talk@memsnet.org Subject: [mems-talk] Any ways to minimize the writing times for HeidelbergDWL66 mask maker? Hi, everyone As title, we are seeking a way to minimize the writing times because of the cost issue. Our cleanroom charges per hour for Heidelberg. Anyone has any ideas?