Simple funnel for PET bottles

I needed a funnel that can be screwed onto a PET bottle. To check if the funnel will fit, one can print the PET thread first (https://www.printables.com/model/514702).

Mine has been printed in PETG without supports and 25% infill for increased stability. A lower infill percentage should work as well.

Used the existing design for the thread to make a funnel that can be screwed onto bottles.