I was looking for a funnel printable in spiral vase mode, yet among the 200+ models found on prusaprinters there was only one that was spiral vase suitable and unfortunately didn't fit my dimensional needs. So I made some models on my own.

Why is spiral vase mode so important for this application? Well, it's the only safe way to achieve impermeability to liquids for the walls of a single wall print*. Thus it saves at least 50% of material and printing time compared to multi-perimeter designs while still being superior under hygienic aspects.

This set contains five predefined sizes of funnels with the following diameters (outer dimensions):
80 mm - 10 mm - 7 mm
60 mm - 10 mm - 7 mm
60 mm - 6 mm - 4 mm
40 mm - 6 mm - 4 mm
40 mm - 5 mm - 3 mm
Of course, all models can be scaled to fit individual needs.

To print them in spiral vase mode, you should use
- a perimeter size that's at least your nozzle's width and
- a layer height that's ⅓ (or less) of your perimeter width.
So, with a 0.4 mm nozzle, it's best to use a layer height of 0.15 mm with a 0.5 mm perimeter or 0.2 mm with 0.6 mm. Top and bottom layers both have to be set to 0.
At 0.2 mm layer height, one funnel will take between 12 and 33 minutes (depending on the size) to print. 

Concerning filament material: This depends on what liquid you want to use the funnels for. PETG is generally not a good idea for objects with short layer times, ABS will dissolve when used with some solvents (or varnishes containing solvents). PLA (as well as LW-PLA and lignin-based biopolymers) is safe in both respects, so in most application cases it will be the material of choice.

* I have to add that this is true for FDM printers only. If you have an SLA printer like the SL1S, you don't have a spiral vase mode (nor could you use it at all) and can't use these model files.