I have a tiny salt dispenser that is extremely nice to take with me when going on a hike but is quite challenging to refill. With this funnel, it is now an easy task.

This prints in vase mode. In my case with 0.2mm layer height with PETG on a 0.4mm nozzle.

You may customize the OpenSCAD model for other salt dispenser opening holes. But if your salt dispenser is larger and this one just fits you can just keep the weird shape I needed.