PLA is an environment-friendly material that is easy to print and has a smooth surface finish. Compared with ABS, PLA has higher rigidity and strength similar to PC, and does not require an enclosed printer. PLA has a low shrinkage rate, no warping, no cracking, and can print large size models. There is next to no smell when printing and it is safe and environmentally friendly. Approved by FDA as safe to use. It can be used for conceptual model, rapid prototyping, and metal parts casting.