3D parts for the frame
OpenSCAD has been used to build the 3D models.
It contains the electronics of the frame. It can easily by 3D-printed in two parts.
It separates the LEDs. It can be either 3D-printed (STL files) or laser-cut (SVG file produced using Python).
It is better to print it in one part, but it can be printed in two parts.
It is used to keep the grid inside the frame.