draw profil and rebuild ( press tab in the blue area write Rebuild .... in the right corner of the screen : press Done )

the rebuild is good to eliminate parasite lines when extrude etc .. )

extrude the profil ... copy the solid and apply scale ( here in the bounding box i wrote 1.2 ) ( 120 percents bigger )

draw a polyline and apply fillet ( this line will cut the 2 solids )

cut the 2 solids ... boolean diff



place the solids where you want ( verify the vertical alignement )

draw a small profil ... it will join the 2 solids all around ( if you draw rounds parts on this profil ... fillet and rebuild it )

transform ... mirror this small profil

transform ... orient ... line to line allow to copy this profile between 2 points, lines etc ...

if you don't know this command refer to moi doc ... it's a very cool function

i copy ( with line to line ) the profile between the 2 solids ( when nyou use that ... it says End .. End to help you in the position of the copies



the first piece is a sweep between 2 rails

the others are networks ( all between 4 borders ) if borders are spliited you need to join the segments













the good way for a network ( 4 borders )







the surfaces created ( sweep and networks are surfaces )

if you want a solid at the end of the job you need to delete faces on the 2 solids ( in brown on the pictures )

check grid snap and object snap and glue the surfaces

select all faces of the final piece and join them ... it's solid

there is other ways to do that ... this one with line to line allow various shapes between 2 volumes