What solution (plasticizer) can be used to soften ABS or PLA structure for a long period of time after soaking the sample in the solution?

I made some hollow container of ABS or PLA by means of 3D printing. I used Acetone to etch and soften ABS. However, acetone evaporates after 1 day, so the ABS structure changes back to the...

26 January 2015 9,105 3 View