I tried to smooth PLA with nail polish remover of my wife. I was surprised of the nice result obtained so easily.
Composition of the nail polish remover:
- Ethyl acetate
- Polysorbate 80
- Cetyl acetate
- Oleyl acetate
- Searyl acetate
- Acetytaled lanolin alcohol
I just leave the pieces to smooth a couple of minutes (5-10) in a jar on the heated bed of my printer at 70 deg.
Surface becomes smooth and glossy.
I hope it will work for you as for me,