Determines how easy the material adheres to the printbed and can be removed from the bed without damaging either the bed or the print.
How tough is the material. From 1 star (very brittle) to very tough
The speed at which the material can be extruded. This is determined by how fast it melts and how viscous it is.
How well can this product be used in an outside environment. The material has to be able to withstand UV-radiation from the sun as well as water and cold weather.
How much smell does the filament produce while printing and how bad is the smell. More stars is better
The amount of energy that a material can withstand when a load is suddenly applied to it. It may also be defined as the threshold of force per unit area before the material undergoes fracture/
How well can the material handle temperatures before it starts to deform.