The Guardian knick-knacks that drop from Sentinels or pieces of walls are very easy to come by and dont feel like grinding. I have loads of them! But the Blueprint Segments do feel like a grind! I did the new Ram Tah mission, explored lots of Guardian Structures, got plenty of knick-knacks (love the expression) and i still needed to choose two Guardian Structures, one for modules and another for weapons and grind the hell out of them! Bad call by FD!
Anyway, if you guys want a good place to farm weapon blueprints, COL 173 Sector OD-J B25-2 B1 is the best i found. It has sunlight, although a bit dim, very few Sentinels and a super easy layout. Every pylon is either in the center corridor where the main-frame is, or just a bit sideways of the same corridor. It's the fastest to grind and Sentinels dont pose a threat. I just ignore them!