PLA (PolyLactic Acid) is a cost-effective biodegradable plastic that, compared to other materials, does not emit harmful toxins in any significant level and is generally easier to work with making it particularly suitable for students.
Since all 3D printers are different, Y Soft certifies filaments that work best with its 3D printers, so schools do not have to trial and error with other more brittle PLA filament brands.