In my experience, thin walled 3D printed funnels tend to split where the cone meets the stem. This funnel has no sharp kinks where material stresses can concentrate, so it should be more durable than the traditional funnel shape.

Two models are provided. One for vase mode single walled prints and one normal model. Print upside down so the wide end will stick to the print bed. The funnels in the picture were printed in transparent PETG for optimal strength and looks.