If you want something tremendous to melt plastic you could try out Hercules 400 Laser. It could do all sort of other things like lightening firework or burn cardboard. The laser has a power of 400mW and it sends a ray that can be seen at very big distances. So if you want to play, than we recommend the Hercule 400 Laser, but you could do that only if you would happen to have $3,000.