What makes PP different from PLA or PETG, and where does it actually make sense?
Different chemistry, different job. PLA is stiff and easy to print but softens in heat and is attacked by many solvents; PETG is tougher but still swells when it sits in some chemicals. PP resists acids, alkalis, oils and most solvents and absorbs very little water, so it is the grade for parts that live in wet or chemical service and for parts that are wiped down with cleaners. What it does not do is fine cosmetic detail - treat it as a working part, not a display part.
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