UPDATE Aug, 12th, 2018/final note:
We've had some really hot days and nights during the last couple of weeks and all LEDs are still in place. The design works as intended - objective achieved, project done.
UPDATE Jun, 25th, 2018:
The LEDs are still in place, nothing's moved at all - I'd call it a success. :)
If you own a Lightberry (aftermarket TV ambient light solution) with WS2801 LEDs that come packaged in bulky IP68 water resistant transparent silicone this thing might be of interest to you. While the Lightberry system is very nice, I always hated how over time, especially during summertime the glue on the velcro that's attached to the LEDs would turn gooey up to the point that the LEDs would fall off.
I've tried replacing the glue, I've tried replacing the velcro but nothing helped. So I've had this idea of designing small holders that can hold the velcro to the LEDs physically, so even if the glue ages over time the chance of the LEDs staying in place is raised.
I gave it a shot and so far it's looking good. Whether it'll work in the long run remains to be seen.
If you decide to use them, please let me know about your experiences!
Printed with DasFilament black PETG@230/70°C.
I recommend printing the holders vertically.