PLA is an excellent filament for 3D printing because the glass transition temperature - where it becomes amorphous and moldable - is relatively low at 60-65°C. Additionally, because PLA is made out of starch and sugar cane by-products, the smell of hot PLA is pleasantly sweet unlike hot ABS. Because it is made out of by-products, PLA is one of the most economical filaments readily available for professional and home 3D printing. Sugar cane and other starch products are renewable resources, so PLA is a renewable product. It is also biodegradable.