I created this snap fit led sign edge that fits MAX7219 led segments. Pictured here are 12 segments but you should be able to add ans many as you want.

Print instructions

MAX7219 LED Array Sign. These parts comprise a frame that fits around 12 8x8 led array segments. You can find them here in 4x arrays. You will need 3 of them.

https://www.banggood.com/MAX7219-Dot-Matrix-Module-4-in-1-Display-For-Arduino-p-1072083.html?rmmds=search&cur_warehouse=CN

Solder 3 8x8 4 device led ends together and connect the 5 wires out the end with the opening. Run the 5 wires to an arduino power, ground din, cs and clock
power and ground run to 5v and ground the other
Clock goes to 13 // or SCK
Din goes to 11 // or Data IN
CS goes to 10 // or CS

You will need 8 of the edge clips and one each of the end connector .stl files

You will need the following arduino libraries. You can find then on github.

MD_Parola
MD_MAX72xx
MD_UISwitch

The code I am running is the MD_Sprites_Library in the MD_Parola examples.

you will need to change the hardware type to match your hardware. The ones above are ICSTATION_HW

Search for this line:

define HARDWARE_TYPE
and replace whatever is on that line with

define HARDWARE_TYPE MD_MAX72XX::ICSTATION_HW