This Custom Long Furby spine-to-furby connector

So this is a part that i made in solidworks for a personal project and it turned out to be more popular than i expected. i printed this to work with a variety of screws but they should probably be course threaded so that they will hold into the pla better. i ended up having to drill the pilot holes out a little more and heat the screws to make them slightly melt the plastic as they went in. this was designed to work with 1/4 inch ball and socket doll armature and a 1998 furby (70-800). i used a