I recently just bought a 3D printer, which I have experience using through a previous engineering job.
I'm trying to think of ways I could use it in an EA-like manner. One organization I found called Enable provides 3D printed prosthetics to those who lack access to traditional prosthetics. So perhaps the best cause area would be towards global health and poverty.
With the pandemic, helping manufacture PPE in my local area seems like great opportunity as well.