I didn’t know that porcelain can be 3D printed. I know for sure that ceramic can be molded.

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I have the notion that these tiny palettes are way too expensive no matter how they are made.

They are not porcelain, but I 3D print plastic palettes for altoid cases. They are great for when I don’t have room to bring my larger palettes on the go.

I’m currently on a quest to find either a larger than large Butchers tray or a sheet of porcelain or any other surface suitable for water color paint,[NOT PLASTIC}sized to fit the right side of my table top same dimensions ,it will give me all the room I need and after a painting session spray and wipe to get ready for the next painting..this should be the watercolor table of all watercolor tables if my plan comes into focus..

thks marialena,sorry bout the typing got a guitar in one hand,multitasking..lol

No problem. Another option would be to use a large piece of glass painted white in its underside. There are ready made ones too.
Glass has same characteristics a porcelain and you can order it at any size you like.

I’m currently on a quest to find either a larger than large Butchers tray or a sheet of porcelain or any other surface suitable for water color paint,[NOT PLASTIC}sized to fit the right side of my table top same dimensions ,it will give me all the room I need and after a painting session spray and wipe to get ready for the next painting..this should be the watercolor table of all watercolor tables if my plan comes into focus..

You might look into white glass custom cut.

ΟΚ ..I was thinking about this yesterday and I had a funny idea.
What you need is something like this :lol::

The covers (lids) of such vintage cooking appliances were enameled and they were huge. Check if you can find any vintage non working cooking appliance at a local market to get its cover. You can then cut it or use it as it is to cover part of the table. It is made usually by enameled steel.