9 Prong Espresso Distribution Tool for the WDT, or the “Weiss Distribution Technique”.
Found here: https://www.thingiverse.com/thing:4819617
The key to tasty coffee, in general, is even extractions. Making sure there isn’t some coffee that is being over extracted, causing bitter flavors, and some that is being under extracted, causing acidic flavors. This is all the more important in espresso, where everything from water contact time to beverage size is concentrated down, exaggerating any unevenness. The unfortunate truth of making espresso at home is that you really do get what you pay for when it comes to equipment, and there is a high barrier to entry, where entry-level equipment may not be as forgiving, and even high-end commercial equipment may not be as home volume friendly. WDT, or the Weiss Distribution Technique, can help compensate for those shortcomings by evenly distributing coffee in the portafilter to promote more even extractions and better espresso. from