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 stability (0.4mm or 0.6mm nozzle)set bottom layers to 0A note on “turbo” finsI'd like to comment on those turbo fins: I consider them mostly useless. Some think that a vortex speeds up flow, but that is true only under some conditions: e.g. to get water out of a bottle. The vortex forms a stable air channel in the center, so air can get in while the liquid pours out. Without it the rising air bubbles get into the way of the falling liquid. The same problem can arise when funneling some liquid into a bot