We have issues working with lead at work, mostly due to toxicity. Putting a hole in a sheet isn't as simple as getting out the drill, not mechanically, but due to all the swarf that needs to be cleaned up. 3D printing a bolt-on cover would be lower risk than drilling lead, a quicker turnaround than getting a die made and lead cast, and give a prototype that doesn't need to be handled with gloves.

For the right application, there are some good wins here.