I designed simplest model of holder for 8mm LED strip for planned printer upgrade.
Each holder is 100mm long. This is exactly two segments of 60 LEDs/m strip. STL file has two holders. Just slide it on steel frame of your printer. One per side or two per side by your choice.
I temporarily glued piece of strip for illustration purpose only. You can see one holder without strip and one with it. Holder can be easily moved up and down but will not fall off.
I used PLA filament.
I designed a cover for my holder. Now it looks more professionally. Carefully fit it on holder with glued LED strip. It will stay in place by design. LEDs will not allow cover to move down or up.