Here's some duckduckgo search results for 3d printing services. Dunno how much they cost or if they're any good though.
You can do 3d printing with sintered metal, but no idea of the durability versus plastic printing.
https://duckduckgo.com/?q=3d+printin...=v243-1&ia=web
Might be worth looking into CNC machining from proper steel as well.