Injection molded rivet-style fastener and housing with snap assembly functionality along with an injection molding process for producing such a rivet without an undercut feature

A fastener assembly, comprising:

• an engaging portion constructed of an injection molded plastic material and having a projecting stem which is interiorly hollowed over at least an intermediate extending range which is structurally collapsible, said stem including a solid end most extending portion which is structurally rigid;
• and
• a receiving portion which is constructed of a deformable material having a surface, within which is configured an inner rim defined edge which is made of a deformable material, said inner rim defined edge further including a chamfered shape exhibiting a narrowed profile, a diameter of an aperture bounded by said chamfered rim edge being less than a diameter of at least said solid end most extending portion so that, upon insertion and passage of said solid most extending portion through said narrowed rim profile, initial deformation of said chamfered rim edge shape preceding alignment of said interiorly hollowed range which is caused to exhibit a controlled collapse by said rim edge in order to secure said stem within said receiving portion.