Max7219 end with slot for usb power connection

This is a remix of:

LED Matrix Modular Case System ( https://www.thingiverse.com/thing:2811071 ) by moonlander (female end).

It adds a slot through which a power cable can be inserted.

Of note, the above can be optionally used in conjunction with https://www.thingiverse.com/thing:3885563

which is a project box cable coupler