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how can I tell if something I printed 6 months ago was printed in abs or pla?
I'm thinking it's going to be destructive, like wipe some acetone on a spot and if it dissolves it's abs.
If it doesn't it's pla. (?)
is there a better way?
Like neildarlow said, PLA is usually shiny and ABS has more of a matte finish. Other than that, destructive methods such as your Acetone test would be the way to go.
If you've got a good sense of smell you can put the object in the sun to slightly warm it and can usually tell by the smell but only if it hasn't been treated/painted etc.
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