Question: What can you cast in a plaster mold?
Disambiguated questions and answers: question: What type of materials can you cast in a plaster mold?
What size castings can you cast in a plaster mold?
What objects can you cast in a plaster mold?
answer: non-ferrous materials
30g - 45 kg
components, gears, valves, fittings, tooling, and ornaments
Natural Questions answer: non-ferrous materials (from the Wikipedia article "Plaster mold casting")