I am designing a plastic electronics housing. It will be made using injection molding. I have a living hinge on one end and I need a locking mechanism so they can open and close the housing without it actually locking. I just need something that secures it when shot. This applications is used everywhere on retainer cases, plastic containers etc.. Are their any locking mech designs on the Internet or 3d cad models with a locking mech design out there that would work with injection molding or even 3d printing?