Hello /sci/! /toy/ here.

I've been trying to research ways to chemically cast polystyrene from old sprues, as buying and maintaining an injection molding machine is out of my budget. Dissolving polystyrene in chemicals such as acetone to create sprue glue is commonly known, but it ends up creating nasty bubbles as the acetone evaporates.

I want to know if there are other substances or techniques that can be used to dissolve plastic and cast it into a "nice" form.