Nylon filament is a printing filament for 3D printers based on a plastic known as "polyamide", often abbreviated as PA. This material is characterized by high mechanical strength, toughness and wear resistance. This means that prints made from it are resistant to impact, bending and do not shatter easily. Its abrasion resistance makes it suitable for the production of functional parts such as gears, hinges or sliding bushes, i.e. parts that rub against each other. It also has good heat and chemical resistance, especially to oils and fuels. A key property to remember is its so-called 'hygroscopicity'. This term means that the material has a strong tendency to absorb airborne moisture from its surroundings, causing problems such as cracking, bubbling and overall poor print quality and strength. For this reason, nylon filament must be thoroughly dried before each print, for example in a specialised dryer, and stored in an airtight environment with a moisture absorber. Printing from nylon also requires higher nozzle and print pad temperatures and, due to the tendency to curl, it is necessary to ensure good adhesion of the first layer to the substrate.