wiglebot says:

Good think he had his handy Leatherman tool from instructables

Skippy says:

Ugh, like #3 said, the schematic makes no sense. Plus there’s a bunch of other things glossed over, including polarity and type of power supply for the laser source, and not to mention how difficult it is to direct laser light like that with such a kludged together system of mirrors, not to mention what happens if a cat gets in the way, or blinds itself by looking into the laser…

jobs says:

#3 Why won’t it work it look like it should.

Gavino says:

Could I use this useful system to easily prevent auto theft to my S.U.V. ?

Greg Allen says:

Cool. Even useful. I could imagine using it in the kind of sleazy hotels I sometimes go to with thieving staff.

But under $20 bucks? You’d better have a good electronics junk box.