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The waterproof laser case!

Step 3Cut optics

cut optics
-Though the title is a bit discouraging, it's not that hard, take the CD case (it must be NEW! we CANNOT afford for it to be scratched! it'll affect the beam.) and a piece of the marker. Using a permanent marker trace around the marker piece. (second picture)

-Remove the top of the case and using some normal "scotch" (clear cheap tape) tape, mask the circle so the plastic is NOT scratched while cutting. (third picture) I'd suggest putting two or three layers to protect it.

-Cut out the circle. I used a jigsaw, but, a hacksaw will do fine, you'll have to cut it a few times to round the corners. DO NOT clamp it in a vice! (unless it has rubber grips) you will scratch the case. While you're at it, use some sand paper and smooth down the edges.

leave the tape on for the moment, we'll take it off in the next step.
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