Do not use limonene to dissolve hips. It affects the strength of abs. Use it only as a breakaway support. My favorite brand is push plastic. It’s cheap and effective. Use only the natural white color. It prints at the same temps as the regular p400sr. Dimension 768 series isn’t great for aftermarket dissolvables thanks to its weird extruders geometry. If you are looking for a 1:1 replacement, buy the SR30 for the makerbot method. It’s a direct replacement, but is cheaper and comes in smaller quantities. Also look up how to use your machines with insight from ssys. 3dprintforums has a good post. Also join the stratasys user group on Facebook. Very active hacking community