To summarise ABS filament will give your printed objects better structural integrity and will be more suited to mechanical use, but it also requires specific types of printers and printing surfaces such as a heated bed.
PLA filament gives you more precise prints with a better aesthetic quality, as well as more flexibility with printing conditions. Simply put, PLA is for hobbyist 3D printers while ABS filament is more suited to commercial grade products that need to endure more rigorous wear and tear.
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