You could almost certainly source a cylindrical body to pour the cast into for cheaper and easier than 3D printing one - of almost any dimension. The tricky part is in the coring shape (for thrust profile), not the shape of the cylinder.
That said, 3D printing an easily-removable mold for coring, such as from wax, would be amazing.
There are 3d-printers (and fairly cheap toolheads) that can handle ceramics, i.e. clay. Resolution isn't anywhere near as good as PLA, so in practice people often print a mold to make the mold from, but it's an option.
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You could almost certainly source a cylindrical body to pour the cast into for cheaper and easier than 3D printing one - of almost any dimension. The tricky part is in the coring shape (for thrust profile), not the shape of the cylinder.
That said, 3D printing an easily-removable mold for coring, such as from wax, would be amazing.
There are 3d-printers (and fairly cheap toolheads) that can handle ceramics, i.e. clay. Resolution isn't anywhere near as good as PLA, so in practice people often print a mold to make the mold from, but it's an option.