Changes

* '''HDPE:''' "milk bottle" plastic. It melts. It gets gooey. It catches on fire. Don't use it.

* '''HDPE:''' "milk bottle" plastic. It melts. It gets gooey. It catches on fire. Don't use it.

* '''PolyStyrene Foam:''' It catches fire, it melts, and only thin pieces cut. This is the #1 material that causes laser fires!!!

* '''PolyStyrene Foam:''' It catches fire, it melts, and only thin pieces cut. This is the #1 material that causes laser fires!!!

* '''Fiberglass:''' It's a mix of two materials that can't be cut. Glass (etch, no cut) and epoxy resin (fumes)

* '''Fiberglass:''' The epoxy resin used in fiberglass is bad to cut, the vapor/fumes of the epoxy resin are bad. The fiberglass mat itself, without resin, is safe to cut.

* '''Coated Carbon Fiber:''' Again, it's a mix of two materials. Thin carbon fiber mat can be cut, with some fraying. However, once coated with epoxy it will emit noxious fumes.

* '''Coated Carbon Fiber:''' Thin carbon fiber mat can be cut, with some fraying. However, once coated with epoxy it will emit noxious fumes.

* Silhouette '''magnet paper''' (sold by Inventables by example): it likely contains chlorine. Emits HCl and nasty chlorinated compounds when cut! Don't ever cut this material as it will ruin the optics, cause the metal of the machine to corrode, and ruin the motion control system.

* Silhouette '''magnet paper''' (sold by Inventables by example): it likely contains chlorine. Emits HCl and nasty chlorinated compounds when cut! Don't ever cut this material as it will ruin the optics, cause the metal of the machine to corrode, and ruin the motion control system.

* '''PTFE:''', also known as '''Teflon''' or any fluorinated polymer it will releases nasty fluorinated compounds (bad for you) and sublimate then deposit on the lenses (likely destroying them).

* '''PTFE:''', also known as '''Teflon''' or any fluorinated polymer it will releases nasty fluorinated compounds (bad for you) and sublimate then deposit on the lenses (likely destroying them).