I built a Lets Split Eh a while back, and part of my build was Keeb.io's aluminum lets split case, which i got along with an acrylic middle layer. Over time the look is less and less good. There have been frosted acrylic layers before that look plain awesome while taking out that glare, so I thought to recreate this look with a PLA shell in the same shape. And in my print selected an infill pattern and density that can provide a neat pattern as well.

Recreating the acrylic piece from the original build also allowed me to address a couple of issues with the design of the original product.

Firstly the cut out around the I/O better accommodates the shape of the PCB itself. The original acrylic not fitting past the edge near the USB C port and had to be modified to fit. More room was given in this design and should fit any Lets Split

The second problem was the original case and layer came with 12mm brass stand offs to allow the promicro of a standard Lets Split. The acrylic of the original middle layer was in two pieces one thick piece measuring 9.5 mm, and another 2.0 mm This leaves 0.5 mm of the standoffs extending past, as well as a refractive line where the two meet.

Anycubic

All-metal Mega

No

Doesn't Matter

Used UltiMaker Cura to generate Gcode, First couple I ran with a decreased wall thickness at 0.6 mm, and 20% infill in Cubic Subdivision generated a nearly centered pattern of squares that I personally enjoy. Would be great to hear what else works in interesting ways, maybe other slicers or a design can be done in exciting ways.

likely 0% infill to be a shell will shine lots of light through

Some of the corners on the first set seem to be warped so and may benefit from running a slower print speed than my 120 mm/s