This is designed to work just like the standard Ford funnel. The geometry is very similar except I made the mouth of the funnel wider to help avoid spills. I also didn't see much value in the clip that is on the original.
Rafts: No
Supports: No
Notes:
Nylon is probably the ideal material to use, but I used PETG which is good for short term contact with gasoline.
It is a bit of a bed adhesion test, so you may need to take extra steps like extra brim to keep it from toppling if you have any doubts. I have printed a couple without issue as is.
The author marked this model as their own original creation. Imported from Thingiverse.