Here are some steps you can follow to make a crucible:
1. Take a mold according to the size you need.
2. Add clay to the mold, making sure it’s airtight.
3. Check the mold for air pressure and water content.
4. Let the mold dry for a day or two.
5. Remove the mold to reveal your crucible, ready for melting aluminum.
Alternatively, you can make a ceramic crucible by taking a piece of clay, working it to warm it up, placing it onto the center of your potter's wheel, and shaping it into a crucible.
: [source](https://diyquickly.com/how-to-make-a-crucible-for-melting-aluminum/)