If you are using supplements you might fill your old surplus containers from a bigger refill package.
But regular funnels are to narrow to use them.
Therefore this is a special extra wide funnel which allows to fill your supplement containers easier and faster.

It is optimised for 35-40mm as minimum diameter.
 

Remark: This is model V2 with a top layer ring around the funnel. Version V1 without that ring can be found here. This funnel can be printed with PLA but if you want to clean it in a dishwasher a temperature stable filament like ABS etc. is recommended.

There is also another variant Wide Funnel V3 with an larger diameter available.

Important: it is possible to print this model with generic filaments but if you are sensitive a food-safe filament is recommended to use!