parametric vase mode funnel

An OpenSCAD parametric funnel with some options likeouter diameter, stem diameter, stem length, cone angleair gap (so air can escape while stuff flows in)“turbo” fins (number, angle, depth), also good for holding filtration paper away from the funnel wallsThis is a vase mode model, so it needs only a few grams of filament and prints fairly quickly. If a funnel gets messed up beyond cleaning, not much plastic is wasted. Printing:use vase modeset extrusion width to 0.7mm (or more) for stabili