The laser cutter came with another lens that we were totally unaware of its existence. Why would such expensive machine be missing one of its main parts? Looking through an accessories box of the laser cutter, I came across a little box that contained something wrapped in white paper- it was the other lens! The lens that we were using would only cut when it was in the metal-cutting position, even though we were not cutting metals. This new lens can cut in the non-metal and metal positions. 

New lens 

The very first thing that I tested  was if it could cut in the non-metal-cutting position. After that, I proceeded to test cardboard, plexiglass, and foam.When cutting foam we were getting beveled cuts. This was the main reason we considered buying to new lens to get better cuts. 

 Circle and rectangle test cuts with new lens. Of each set, the left pieces were cut with the old lens and right pieces with new     lens.

We can observe that the new lens can cut straight down the foam without creating a bevel. This is exactly the type of quality we need and expected from such a laser cutter. With our old lens it was really hard trying to get a straight cut; we got pretty close but nothing compared to this new lens.