My brother has an O'Day 40 foot sailboat. One of the hatch roller shade clips was broken. This is the part where the string pull is held to keep the shade closed. Apparently you cannot find the part without the whole $200 shade. So I made a few for him.

Two models are available. One with 3 mm screw hole, the other with 4 mm.

Print with PET-G or better standing on the wide end (not the side with the bored hole), no supports. 

I re-designed the 4 mm version for easier screw insertion. Not needed, but less finagling. (It's not as pretty after installation.)