Styrofoam shredder video
Not my video, may not be the best way to do this, but it looks like it got the job done, and looks like fun. I don’t think I’d use styrofoam for house insulation, but if you have an outside storage box or something….or need to fill a beanbag chair….or???

2:52 “Obviously we’re going to have to be really careful when using this thing”!

Good idea! I don’t think the air quality when you use the shredder would be that great though….