I created a topic ( Investment Casting: Everything You Were Afraid to Ask or Didn't Know), Where I'll describe, show in pictures and videos, what I do every day. I'll show all the steps step by step specifically for this forum, using the example of a product required by modelers.
I apologize in advance; English isn't my native language. But if you're interested, I'll tell you everything you need to know about how to do it without spending a lot of money.
By the way, I use the same technology to make things like this:
(Yes, this is my work, it's 14k gold, these aren't photos of a neural network; I have photos of the intermediate stages as proof):
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