Just to add to the brain storm session:- Ink jet transparencies have a special coating that accepts the ink and allows it to dry. Looking into this might give some ideas, ie. could even be a way the copper surface can be chemically prepared. For the photoplotter idea Luxeon make very high power (1W and 5W) blue LEDs (460nm) used for dental curing. Say aaaahhhh. Brain empty now. -- Brent Brown, Electronic Design Solutions 16 English Street, Hamilton, New Zealand Ph/fax: +64 7 849 0069 Mobile/txt: 025 334 069 eMail: brent.brown@clear.net.nz -- http://www.piclist.com hint: PICList Posts must start with ONE topic: [PIC]:,[SX]:,[AVR]: ->uP ONLY! [EE]:,[OT]: ->Other [BUY]:,[AD]: ->Ads