Electroneum (ETN) coin.
Use the pause feauture of your slicer to pause the print and change the material if you want a colored version.
If you like this thing and want to tip me, this is my ETN address: etnk2oHTW9Z9bQqtPmeB8DZYAChw7oZG8GJaemj3q23MNVKhwTNnSA71EuQWZmEhKQUXaLAw2ML9u61Pk7g9diSD2GPpftCU6f