60w hurricane laser. we mostly engrave in wood, but occasionally cut 1/4" plywood panels. we're using it (average) less than five hours a week.

i replaced my 2" lens with an inexpensive one from amazon a few months ago. we've been cutting a few templates from 1/4" ply and the cut depth has been inconsistent. it appears the lens is on its way out.

how often should i be cleaning the lens?

are better lens worth the money?

what can i do to increase the usage between replacing the lens?