UPDATE: I also have done a 32x32 Matrix in a IKEA picture frame with WLED:

https://www.printables.com/de/model/501107-led-rgb-matrix-ws2812b-esp32-wled-32x32-round-squa

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Hey :)

I designed a 3d printable grid. Its also possible to laser-cut it or to use a cnc.

Its for a DIY LED-Matrix with 16x16 WS2812B LEDs. The Idea is from Scott Marley.

You need to print:

17 x Rasterblatt-LED-Matrix-v4.stl
17 x Rasterblatt_mit_Nut-LED-Matrix-v4.stl

OR

17 x LED-MATRIX-GRID.stl
17 x LED-MATRIX-GRID-wStrip.stl

The difference is that the grid connection is a little looser with the second option. The thickness of the first option is 2.4mm and the diameter of the grid cut-outs is also 2.4mm.
The second option is 2.4mm and 2.6mm. I recommend the 2nd option (LED-MATRIX-GRID)

Watch this videos:
https://www.youtube.com/watch?v=D_QBlFIQk-o

The right photo/picture frame:
Black: https://www.hobbycraft.co.uk/black-shadow-box-frame-30cm-x-30cm/633882-1000
Grey: https://www.hobbycraft.co.uk/grey-shadow-box-frame-30cm-x-30cm/633886-1000
White: https://www.hobbycraft.co.uk/white-shadow-box-frame-30cm-x-30cm/633878-1000

Print instructions

I created the 3mf files for Prusa i3 Printers.

0.2mm
PLA (black)