i have a bunch of different blasting setups and blast plastic parts all the time. the key to plastic or really anything is the media and pressure. you need to be using the right media. in my one cabinet i have crushed recycled glass. its very fine and cuts well. i turn the pressure down to about 40 psi and keep the gun at about 8" away. this keeps the media from digging into the printed part. its very much like spray painting a matte finish on your part. it does work nicely.......IF its the type of look your going for.