I never did get that particular laser to work properly. Eventually, I think, I over powered it and burnt out the laser.
I did, however, end up using a 2.5 watt 450nm laser that worked quite well. As I recall, PVC should never be cut with a laser for a couple of reasons; 1. The fumes are toxic. 2. The fumes can damage the lens of the laser.
You could use it to cut very thin acrylic, as long as it isn't clear acrylic. For the clear stuff, you'd need a much higher powered laser, such as a CO2 40-50 watt laser. When using lasers to cut anything, always have plenty of ventilation, you never know what's going to give off toxic fumes.