All things in moderation.
One question for the 3D printer crowd: PLA will probably fade and crack quickly-ish with sun exposure in a garden, any material selection ideas to extend the life without injecting a plastic into the ground next to veggies?
Very extreme heat will affect it, 90 degrees or so will probably not, I have had a painted all-PLA weather vane outside for a few months now, and it doesn't appear to have visually or functionally degraded at all.
maybe you just pull them in the winter? i supposed that’s a no-brainer in a veggie garden at least.