Are you sure PLA foam dissolves in acetone? You might want to do a test to confirm before committing to a big print. As Drizzt321 says, ABS can be nicely smoothed with and acetone but it would be a ...

I’m not aware of any good site that’s somehow truly independent. Most of them do host all kinds of files. There’s not really a lot of good standards for other machines though. My laser files for ...