Ansys Design Modeler
Negative Volume
https://cfd.ninja/
Download the file: https://cfd.ninja/design-modeler/design-modeler-fill-negative-volume/
FILL Command
* Cavity
* Caps
ANSYS WORKBENCH
A Focussed Ion Beam cutting aluminum with Pb/Bi inclusions. Note the marker is about 1/2 human hair in diameter