What is the main advantage of PLA over ABS in FDM printing?

The main advantage of PLA (Polylactic Acid) over ABS (Acrylonitrile Butadiene Styrene) in FDM (Fused Deposition Modeling) printing lies in its ease of use and environmental benefits. PLA is known for its lower tendency to warp during the printing process compared to ABS, which often requires a heated bed to minimize warping and is more susceptible to temperature fluctuations. This characteristic makes PLA particularly suitable for those new to 3D printing or for projects where reliability and ease are paramount.

Additionally, PLA is derived from renewable resources such as cornstarch, making it biodegradable under certain conditions, which appeals to environmentally conscious users. This aspect is a significant advantage over ABS, which is a petroleum-based plastic and is not biodegradable, raising concerns about environmental impact post-use.

The other options do not accurately reflect the primary advantages of PLA over ABS. While PLA may sometimes be less expensive, its cost-effectiveness is not the defining characteristic that makes it preferable in many scenarios. The maintenance of the printer is generally related to printer type rather than the filament itself. Lastly, PLA actually has a lower melting point than ABS, which further supports its ease of use since it can print at lower temperatures.