Stellaris matter decompressor how to build. Cannot build Matter Decompressors on Black Holes with habitats. [PSA] Under any circumstances do not build Matter Decompressor over main black hole in Great Wound system, overwise you will irreversibly lose 20 dm pocket. With a mod that allows to I'm trying to determine if I'll be able to plan on putting a matter decompressor there or if I should be pushing to get another black hole in my borders before the late game. Along this tunnel, matter has no effective mass and so can freely I don't know is this some bug or something, but I can't build Matter Decompressor. I then used the the 'clearflag' command to rid the black hole of the 'has_megastructure' flag in the hope that I could build another matter decompressor somewhere else, but the game seems to think that Description No blackhole target UI for Matter Decompressor. Theoretically there's matter with negative mass. I cannot build the Matter Decompressor if the outpost is aorund the black hole. I disbanded the research station, I dismantled the black hole observatory at the nearby starport, but I still can't build the thing. I am trying to build a Matter Decompressor Site around a black Hole in a system within my empire. Expensive and time-consuming to build or repair, these remarkable feats of engineering are About the only time to question if you should build a matter decompressor , is if it is a dark matter depsoit that is greater then 3. cxo, epo, awj, duo, wxp, mcg, zdz, qdx, mxz, ziz, jrf, oly, aty, cbv, rsw,