While working on getting my printer back in shape I printed a small gear with HIPS (High Impact Polystyrene), it was about 3mm thick, you can see it here, with two bananas for scale:
I figured this was a decent amount of HIPS and the thickness might be representative of what would be used for dissolvable support, so I put a small amount of limonene (enough to fully submerge it), placed it on my printer's heated bed and set the temperature to 100C (which is of course much lower than the temperature it actually reaches...). After two hours it looked almost gone:
Half an hour later I couldn't find the object at all.
I was pleasantly surprised at the speed at which HIPS dissolved. The limonene became cloudy, I'm not sure how much HIPS can be dissolved or if I can somehow get back the limonene, I'm trying a few things so there might be an update in the near future. One thing to look out for is that HIPS becomes very sticky as soon as it's put in the limonene, so it might be a good idea to set the object on a screen or something that stops it from sticking to one of the jar's walls.
