This is an insert to fit a Parker Quink bottle, with an internal neck diameter of 30mm.
With the insert in place and the cap on the bottle, the user can just tip the bottle to fill the reservoir. Then a dip-pen or brush can be loaded easily without having to reach right down into the bottle, avoiding a whole lot of potential messiness.
Printed PLA doesn't create a reliably watertight object, so I suspect the ink may seep away over time. However, it's a simple matter to just refresh the reservoir, or else I guess you could line the inside of it with epoxy or something.
The STL can be downloaded free from https://www.thingiverse.com/thing:5984034
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