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The glass transition temperature of PLA is around 60 C/140 F.  It's unlikely to warp from direct sunlight alone, but PLA has two other characteristics that make it unsuitable for printing gear:

1. PLA is brittle.  Where something printed from PETG or ABS would flex and absorb a blow, PLA will crack.
2. PLA is highly susceptible to creep.  A constant force on a piece of PLA will cause it to flow, permanently changing the shape of the part.