Some expert PLA filament users recommend buying at least two rolls of filament to get started. The general rule of thumb is to estimate the weight of the projects you intend to print and then buy at least that amount of PLA. Be sure to include about 30 – 40% extra to cover test prints, print fails, and any other unforeseen instances you could come across as a beginner. It’s always a good idea to perform one or two test prints to ensure your settings are correct. Choose a smaller object as a test print to avoid wasting filament meant for the eventual project.