PCB Laserprinter V2 in youtube

Hi,
A few days ago, I watched this PCB making using Laser printer in youtube.
It's very impressive work for making PCB with small laser.

For Direct laser irradiation of photo-positivematerial

I want to know
1. How they can fouscing of 2 lasers for only one small spot
2. What is the photo-positive material that they use as base PCB material. ( After that material is reacted by laser, that material changed white color.)
3. How they can control laser beam ( actually X carriage do not move, only laser mirror or something move laser beam as like scan beam..)

Also so many peoples are trying to contact to this machine's author with youtube comments,however, I think, they cann't contact with this machine's auther's.
So, please share their contact or web site information if you know them.

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[dreammakercnc.blogspot.kr]
korean blog page: [blog.naver.com]

I think you'll find the gantry is moving backwards as it does each line it's just the movement is so small and slow it doesn't look like it moves.

Ben

According to the author comments in that videos, the two diodes are not pointing at the same spot, they are just used to work on two lines in the same pass. As a result, the job time is halved.

As plexer mentioned, the gantry obviously climbs after each pass, moving in the upwards direction.

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http://www.i3d.ro