A while back I posted my laser addition to my cnc. After having it a while it seemed like removing the router each time I wanted to use the laser would be a pain. This week I ordered some weaver scope/accessory rails and a scope riser for it.
Weaver Rail: http://www.amazon.com/gp/product/B00...ilpage_o00_s00
Scope Riser: http://www.amazon.com/gp/product/B00...ilpage_o00_s00
I used a piece of 1.5" aluminum angle to mount the weaver rail to on my router head.
The scope mount was screwed to the laser's mounting board with a tee on the back to allow me to keep the laser over the cnc bed as much as possible, but I will lose a few inches in width.
This will allow me to quickly add the laser when I want to used it and remove it to keep dust and chips from clouding the lens when not in use.