I was wanting to do some custom lighting in my computer setup but didn't want to spend the high price tag. These panels print in under 2 hours each I printed 4 of them at a time and was able to get all the lighting setup done in one day from print to install. Thin 2 layers of filament for front of panels lets light shine through beautifully. I used inexpensive LED light strip and the clips to join them together off amazon and in total for materials spend just under $16. Been using them for about a year now and have worked perfectly the entire time. The caps are to cover the screws if you don't want to see them and the flat 2 track piece is what is shown in the picture on the front of my desk.