I needed a case for my NeoPixel ring with 24 LEDs and rather unusual dimensions (outer diameter: 73 mm, inner diameter: 53 mm), so I designed this one in Fusion 360.

Both parts print supportless and no glue or screws are required for the assembly.

The case itself is printed in PLA and the diffuser in Overture PETG Transparent using the "Concentric" Top/Bottom Pattern.