I just got my M2 and one thing that was bugging me was the case lid kept popping off. I thought about drilling a small hole that I could insert a pin in to prevent it from sliding. But I decided I wanted to find a solution I could print. Here it is. I printed it with 40 percent infill rectilinaer. I had some issue with to much heat in the small nubs but peeled it off and jammed it in holes and it has not moved since.