I recently got some laser transparencies made at Staples. I taped two 8.5x11's together to make an 11x17 image. The strange and frustrating thing that happened is that after exposing the screens under a 150W incandescent bulb, the image came out fine on the screen, but it was slightly off from the transparency it was created from. If I try to register the transparency with the screen it made, it's off slightly at one end (like an 1/8"). It's a two separation design with tight registration, so the screens are useless. Does anyone have any idea, why this might happen and possible solutions? I'd like to continue using the incandescent bulb, as I have all the exposure times well figured out and it's worked fine for me in the past. I've never had any similar issues using my own inkjet printer, I went to Staples because I wanted more opacity and my inkjet wasn't cutting it. Thanks for any advice.