Snap close connector that's great for holding small items or fidgeting with. Two versions to chose from. Type 2 allows the connectors to connect to each other, but does require supports - take your pick.
Nothing fancy here. Just regular 0.2 mm layer height and minimum 15% infill. Type 2 sides require supports.
3 x M3 x 14 mm screws
3 x M3 washers
50 mm paperclip
Do not use one of these to hold any sort of load or in a situation that could injure you or someone else.