The Curvy portafilter funnel

thingiverse

The Curvy portafilter funnel ============================ **Author:** Dmytro Strelnikov **License:** Creative Commons BY-NC-SA ----- ## Motivation I have two slightly different portafilters so I wanted to have a funnel that holds exclusively on the basket, i.e. is compatible with any portafilter provided the basket remains the same. At the same time the funnel should not hold on the internal wall of the basket because it is not ideal for the distribution of the coffee grounds. I liked the idea of a magnetic funnel, but embedding of the magnets makes the design more complicated. Instead I designed the funnel in a way that it it mimics the magnetic behavior, i.e. sits tight enough on the basket to not fall off while still being easy to remove by hands. After testing a few more bulky prototypes I ended up with this **curvy** design. ## Available STLs & customization In the thing files you will find some pre-generated STLs for: - Gaggia Classic Pro stock basket (default parameters) - VST Precision basket (`r_edge = 2.85 mm`) If you need to generate a custom STL: 1. Open the `.FCStd` file in FreeCAD and adjust the sizes in the `parameters` spreadsheet. 2. Switch to the "Mesh Design" workbench, select the body and press "Tessellate shape". I recommend setting the surface deviation to 0.1 mm and the angular deviation to 1 deg. 3. Once the tessellation is done, select the meshed body and press "Export a mesh to a file". If unsure about the sizes of your basket, make a test by printing only the part of the funnel which directly sits on it. To achieve this you can move the model partially below the print bed in a slicer. ## Printing instructions - placement: upside down - infill: 100% - layer height: adaptive 0.2 ± 0.04 mm - top/bottom pattern: concentric - supports: no ## Post-processing Hand buffing using 400 to 2000 grit sandpaper is recommended, but is not absolutely necessary. Also, if you feel that the funnel is not really sitting snug on the basket, leave it for a few minutes on a preheated portafilter. ## Food safety Please mind that generic 3d-printed parts are not food safe unless you took additional measures to ensure that. ## License This design published under [Creative Commons BY-NC-SA](https://creativecommons.org/licenses/by-nc-sa/4.0/) license. > This license allows reusers to distribute, remix, adapt, and build upon the material in any medium or format for noncommercial purposes only, and only so long as attribution is given to the creator. If you remix, adapt, or build upon the material, you must license the modified material under identical terms. As the author of the design, I hereby explicitly declare that the sale of the printed part for the price not exceeding 3€ (excluding the shipping costs) per item **is not considered as a commercial use**, but rather as a compensation of the material cost to the maker.