This is a simple case for the Max 7219 with two set of pins on either side. One hole will slot in the pins and the other pins will slide in. It is a tight enough fit for it not to move easily. I hope you enjoy this creation. I used black PLA for this print. Also include is a version with about 2mm wider holes for plugging things in. I found this useful as some jumper wires I used did not fit very well.