Hi all, here is a simple funnel I made for filling travel-sized (95 mL) Listerine bottles from the full-sized (1 L) ones. Thought I'd share it in case anyone was looking to do the same. I'm sure it could be used for other purposes by scaling it in the slicer.
There are two variants, one where the vent ends with the throat of the funnel (my preferred option for the Listerine bottles), and one where the vent extends all the way to the top of the funnel (might be better for scaling to fit another application).
The model is meant to be sliced in vase mode, with no bottom layers. I printed with HIPS from Gizmo Dorks in white, using a 0.16 mm layer height on my Bambu Lab P1S. It turned out well, costing about 1.15 g of filament. That being said, the layer height is not critical and taller/thicker layers may offer more strength if you intend to toss this in a bag.
I have provided the STEP files, and the Onshape model is public and linked here in case you wish to make any modifications. Happy printing!
The author marked this model as their own original creation.