In some future WIP release the MultiPipe command will also get a Grasshopper component to replace the Fattener and allow more ways of controlling the radii and options.
I’m also working on improving its handling of nodes with high numbers of connections-
I can’t promise exactly how soon this will be ready for release though.
Yet another option to consider would be to simply make a closed mesh pipe with rounded ends for each line segment, ignoring the overlaps. For rendering it doesn’t matter, and most 3d printing software these days doesn’t have a problem with overlapping solids, so you don’t necessarily ever need to boolean them.