A 64x64 RGB LED matrix gets a clean, square-pixel face using three layers: a 3D-printed light-blocking grid, a sheet of parchment paper, and a clear plastic cover. Builder Davisan1001 published the full enclosure design on Thingiverse, including a mount for a Raspberry Pi.
The grid is the most interesting part. Davisan1001 skipped CAD entirely and exploited slicer settings instead: print a flat square using grid-pattern infill with zero solid top or bottom layers, and the slicer generates the cell walls automatically. It required iteration to nail the spacing, but it works. The diffuser took more trial and error. Plain white paper killed too much light. Wax paper handled poorly and produced bad off-angle viewing. Parchment paper, a standard baking supply, hit the balance: thin, flat, consistent opacity, and enough light transmission to preserve clarity.
The full construction sequence and files are on Thingiverse. Read the original for the specific slicer settings that produce a usable grid without custom geometry, and for the off-angle performance comparison between diffuser candidates that makes the parchment paper choice concrete rather than arbitrary.
[READ ORIGINAL →]