PLA

PLA (polylactic acid) is a biodegradable thermoplastic polymer produced from renewable resources such as corn or sugar-beet starch. For makers and fablabs, PLA is the most common 3D-print filament because it has a relatively low melting temperature, minimal warping, and is therefore easy to print on FDM machines. Mechanically, PLA is fairly stiff and suitable for visual prototypes and decorative items, but it is more brittle and less heat-resistant than many engineering plastics. Finally, while PLA is biodegradable, it typically requires industrial composting conditions to break down effectively; storage, recycling and post-processing are important considerations in a responsible maker workflow.

Imagine you are in the fablab and need to print a prototype phone stand. You pick PLA because it prints easily: set the nozzle to about 190–210°C, a heated bed to 40–60°C, enable part cooling, and use a 0.2 mm layer height for a good balance of speed and detail. Because PLA has low shrinkage you can often print multiple parts at once without severe warping, but be mindful of its brittleness for thin or load-bearing features—consider thicker walls or design changes. After printing, PLA is easy to post-process: sanding, filling and painting work well; solvents like acetone won't smooth PLA as they do ABS, and for higher heat resistance you'd need annealing or a different material.