Quoted from edednedy:Yeah, what drsfmd said. I've made these before. Just be sure to use PETG or Lexan (polycarbonate). Acrylic won't hold up.
As mentioned here above, if you make it out of polycarbonate, you shouldn’t have anymore future problems. I made the mistake of making mind from acrylic the first time, shattered after about 1 month. The polycarbonate has lasted years.