The Olsson Ruby 1.75mm (Pick a Size)THE OLSSON RUBY ONE NOZZLE FOR ALL MATERIALS Can be use directly in the e3d all metal kit and many others 0. 4mm 0. 6mm 0. 8mm THE OLSSON RUBY FIVE REASONS TO GET THE OLSSON RUBY ONE NOZZLE The Olsson Ruby will work with a huge range of materials. PLA, ABS, CPE PET, Nylon, and composites with abrasive additives such as Carbon fibre, Steel, Wood, Boron Carbide, Tungsten and Phosphorescent pigment, are some of the materials sucessfully tested so far.