This is a clip for holding a Tag-Connect “no legs” cable onto a PCB. One side has flexible pieces that clamp onto the cable's aligning pins. This side should be placed towards the PCB.
Printing with the clamp side down worked best for me. Printing with the clamp side up sometimes resulted in the two sides of the clamp getting fused together.
There are separate models for 6, 10, and 14-pin cables. I have only tested the 6-pin version, though the 10 and 14-pin cables are identical aside from the spacing between pins, so I expect those models to work too.
The author marked this model as their own original creation.