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@Rik_Van_Looy
Staying with the subject of printed bits for hydraulic discs, this sort of thing is on my longer term projects horizon.... (although I'd hope to make mine more ergonomic/tidy)
The designer is selling through the Shapeways portal
Material/process on this is the relatively cost-effective binder jetting method where the stainless powder is inkjet printed with a bonding agent. In a subsequent curing process the binder is replaced with bronze to create a reasonably strong (10% porosity) material rather like a sand casting.
https://www.sculpteo.com/en/materials/binder-jetting-material/binder-jetting-stainless-steel-material/