It is
this file.
I followed the procedure in Treatstock, uploaded the model, chose resin as the material.
Then, I checked the nearest to me (with fair feedback) international printers and selected "PFactory" in Italy (feedback score of 55, five stars).
Cost was $15 including shipping.
Late last night I received a message from Technical support at Treatstock.
Message was "...
printer cannot print due to xxx reason, we have located another who can do but with $20 extra, please let us know..."
I log into my Treatstock account where I see a PM from PRIAMOND printers in Germany, saying "...
I cannot print for you, sorry, Technical support will help you further..."
How the heck did Priamond get involved, I have no clue.
I suppose the Italian guy could not do the job, he passed it on to the German guy, ditto there, so support had to solve it for me.
All I know about 3D printing is from you guys here (mainly Roger & Andreas) plus the local friend who has printed your bowl in wood resin.
I assume these 'print shops' are essentially run by individual enthusiasts who are very IT-capable and therefore exhibit this type of comradeship and support behind the scenes.
Last but not least, fair and well noted all the comments for the bowl by our Spanish friend Fredyx.
I hear, however, from my friend who printed and water-sealed three of these, that the bowl is extremely well thought-after in all respects, and it works flawlessly.
Have not had the bowl in my hands as yet, but my friend has used it repeatedly and says all little details in it are very well tuned actually.
To be honest I am personally in favor or larger bowls also, but as I trust my friend I am sure this design is very good already as is.