Tiny funnel designed for common 17 ml dropper bottles. The outer diameter of the drain is 8.5mm, just big enough to fit snuggly in the bottles displayed.

Each funnel takes about 2g of filament to print, making them no-guilt disposable. 

I wanted a quick and disposable funnel to transfer my citadel paints into dropper bottles. With these, I can use one funnel per bottle and don't have to worry about cleaning funnels in between paint transfers.