This is a clothes peg or clothespin that does not require a metal spring, but instead uses a plastic spring. I've used PLA to print mine, I have not tested with ABS.

Assembly shown here https://youtu.be/8ksQmWpUyx8

v1: Print two Peg.stl and one PegSpring.stl to create one complete peg. Assemble by placing the two halves of the peg together over the top of the PegSpring. Push the PegSpring down into place with a screwdriver until it clicks into position.

v3: Print two PegV3.stl and one PegSpringV3.stl to create one complete peg. Click the spring into place in one of the peg halves, then pry open the spring a little and click the second half into place.

I use them as bag clips in the kitchen, but I'm sure they'll have many uses. Post "I made one" if you come up with a different usage.

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UPDATE 15th Mar 2018: I've added a PegV2.stl that has more space for the spring, which should reduce the amount of pressure on the walls. The pictured blue peg is V2.

UPDATE 25th Mar 2018: Removed PegV2 and added PegV3 and PegSpringV3.