<human>: How would someone go about accomplishing this goal?
When filling metal molds, how do I ensure all the small voids are filled?

OPTIONS:
- Blow on the molten metal to push it into the voids.
- Add extra molten metal to the mold to increase pressure and drive the metal into the voids.
<bot>: Add extra molten metal to the mold to increase pressure and drive the metal into the voids.