Then you can make the prototype out of wood, concrete, steel, etc.
Buy some resin, or plastic semi-finished products, brush on the original you made, brush a layer, put a layer of cloth (preferably fiberglass)
The cloth is thick or thin. The innermost and outermost should be fine cloth, and the center should preferably have three or more layers of cloth. All should be coarse cloth.
Take it off as is when it's cured.
Fix the breaks again.
The mold is made.
With this feeler you can make it. First brush the mold release agent, and then the semi-finished product with plastic is brushed on the mold in the same way.
After curing, it is ready.
(If the shape of the mold is complicated, it is good to brush two millimeters thick silicone when making the mold.)
Go to the market and ask for the price of plexiglass fiberglass.
This is still cheaper.