Diffusers of varying length used to smooth the light coming from my under-cabinet LED lighting strips. With these attached, the light now appears to be a continuous line rather than individual bulbs. Apologies for the random lengths; this is what I needed for my project.
Includes tabs to mount with screws or nails. But I just used a blob of hot glue on each tab.
Print in clear filament. I used PETG.
I printed them oriented vertically, NO INFILL, maximum layer size, with a small brim, no support. This is obviously limited by your printer height. i3 printers may have to go very slowly to prevent the model from wobbling.