No

.15mm

These clips are so small that there isn't much need for infill. If you use 0.15mm layers and have 4 to 6 wall layers, you'll get a very strong solid part.
Arrange them in neat rows when you're printing to get a whole batch at once.

These clips hold the lights very securely and are intentionally difficult to remove. If you want them removable by snapping a wing off, print them with the large flat side down. If you want a clip that is practically permanent once the LEDs are in place, print them vertically.