Embudo plegable/foldable funnel

youmagine

You can find many silicone collapsible funnel models on Google. I thought it would also be possible to make them with 3D printers and flexible filament. After several tests, here is my design. The areas where the fold occurs have a smaller thickness than the rest of the funnel precisely to facilitate this folding. It does not make sense to scale the piece to smaller sizes because the thickness would become too thin and lose its tightness. Scaling it up to larger sizes should work, although I haven't tried it yet. Although the commercial product is for use in the kitchen, the filaflex one, due to uncertainty about whether it's toxic or not, I would only use it to pour car oil.