The Maraxsis planet mod requires the use of FluidMustFlow ducts (giant pipes) containing lava.
As a user, adding simple compatibility is easy enough (whitelist the ducts for molten fluids in settings), but it leaves you needing to offshore-pump directly into the duct intakes, which is ugly and inconvenient, and connect duct exhausts directly to foundries, which is even worse.
I've made my own compat-mod (not published) which adds the "molten" connection category to the relevant pipe connections, Together with the settings change enables proper compatibility. I can't find a way to whitelist the ducts with my mod instead of settings, and I imagine others might also want this compatibility given how popular the planet mod is.
I suggest the FluidMustFlow compatibility should probably be optional (off by default?), but when the Maraxsis mod is also active it should be forced on and heat resistance added to the Maraxsis trench duct.
The items/entities in FluidMustFlow that I've whitelisted for molten fluids:
- duct, duct-small, duct-long, duct-curve, duct-t-junction, duct-underground, duct-intake, duct-exhaust
And from the Maraxsis mod itself (I have not tested if this is actually necessary):
- maraxsis-trench-duct
