Thanks for the design! I made a bunch of these in an effort to try to seal my tent shut at Burning Man to avoid dust getting in. The mechanical design of the clip is great, and it really bites down hard on whatever you put in it!
However, I found that the high-desert sun made quick work of the PLA, and after the first day most of the clips became deformed and fell off (3rd photo). So I'd suggest using a temperature-resistant material or avoiding direct sunlight.