Well I have to confess that I lied to the GF and told Koptis that it was thick PG Clear Acrylic, but cleaning all 3 lenses (one the left side of the gantry, one to the left side of the printer head and the bottom facing lens) has made some beautifully smooth cuts on plastic covered extruded acrylic.
1st pic is the long view of laser cut versus saw blade cut:
2nd pic is close up comparison of saw versus laser:
The last 3 are the mated laser cuts side by side:
So lens Cleanliness is next to Laser Goodliness (and even your GF will forgive for lying to it about non-PG)!