I have placed a post in the site and shop thingy about the preview problem, I have had it myself as well and it would probably be better to fix it while this forum only has 20 posts and 4 people.
About the acetone. I could have sworn the cartridges were made of PA, but now that I think of it, it could also be the carrier. I will see this afternoon what material it is made from and follow-up. ABS becomes a thick fluid when subjected to acetone. Use too much acetone on a part and it will melt. When the acetone vaporizes, the ABS will resolidify. It should ‘sinter’ the grains of ABS powder together if all goes well. Now lets hope that acetone and C6602A cartridges like eachother, because the idea is interesting.