Wind turbine blade counterweight - GIF

[Jon]

And yes, this does look like a giant version of the LEGO brick separator:



This isn't a one-off 3D print; it's an official LEGO part (#630), for separating what is now tragically known as "Classic" LEGOs. We didn't have these when I was a kid, or we didn't know they existed. Like many tools, it's largely a replacement for teeth and nails.