You're going to have the weight of the forks and expensive heavy OTA riding on those spacers. Why risk it on a material of unknown structural integrity? Why not get them machined out of aluminium instead? Much stronger, not at any risk of cracking. Ask Joshua Bunn for a quote. I've never seen anything but high praise for his work from happy customers.
Specialist places can 3D print metal but this seems like an easier job for a conventional lathe or mill.
Joe
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