Holder for 10 mm LED strip, slides in from the side, use #4 x 1/2" flat head screws to secure. Size is 140 mm x 15 mm x 4 mm. I am putting a led strip around a projection screen, I will use a bunch of these to attach it to the bottom part of the screen. The 2 screw holes are there, but they do not show up in the rendering above. I made this for the non-waterproof strips and have not tried it with the waterproof ones.

It printed very easy laying down flat. I tried black and red, the red PLA worked a little better, cleaner.