I tried cutting stencils on the laser from a number of different plastics but the results were not good. The heat would cause the edges to curl slighty - enough to make applying the solder paste a problem. My solution was to photo etch the stencils instead. The setup is very cheap and works well. I used resistcoated brass, laser printed artwork and a UV facial solarium bought on Ebay for the exposure. About 1/100 the cost of buying a laser and does the job well.