Espresso GrindDozer – Coffee Funnel, Doser and Distributor

prusaprinters

<p>A simple tool for mess-free grinding, dosing and even distribution of coffee grounds in espresso baskets before tamping. The tool consists of two rings that are screwed together with a variable number and sizes of spacers between them to adjust the coffee dose. Designed for standard 58 / 58.55 mm baskets. When tested for dosing consistency, the tool showed a standard deviation of dose weight of 0.13 g.</p><p>How to use the GrindDozer (see the appropriate picture):</p><p>Assemble the tool with your desired number and sizes of spacers. Place it on an espresso basket inserted in a portafilter.</p><p>Start grinding coffee in the basket while turning the tool to distribute the grounds.</p><p>Grind slowly towards the end, stop grinding when the surface of the coffee is smooth and there is a small heap of extra grounds pushed around by the distributor arm (the size of the extra heap determines the overall dose consistency).</p><p>You can either discard the extra heap, or (and that's what I do) you can gently tap the bottom of the portafilter against your tamping mat and turn the tool again to distribute the heap (the tap makes room for it in the basket).</p><p>Now you can either weigh the dose and re-adjust the spacers as necessary, or, if you have the dose already dialed in, you can proceed to tamping, brewing and enjoying your espresso.</p><h3>Print instructions</h3><p>Print in PLA (food-safe certification welcome, but that's up to you). All the parts print upside-down with respect to the the orientation when the tool is used. The STLs are already flipped to the correct printing orientation. The only bit that needs supports is the distributor arm of the inner ring, the rest is fine without supports (see picture).</p><p>I also usually print threaded parts with different layer heights so that they do not bind (but it's not necessary). The threads may be tight initially, just work them a couple times to wear them in and then wash off the dust.</p><p><i>UPDATE: I've added an alternate version of the inner ring with increased clearance, if the original fit (which is still my go to option) is too tight for you. Or alternatively you can scale down on X and Y to get a looser fit (not Z – it would change the thread pitch).</i></p><p><i>UPDATE II: I've added two alternate versions of the inner ring (with standard and increased thread clearance) that reach 5 mm deeper in the basket.</i><br>&nbsp;</p><p>Don't go too crazy with elephant foot compensation on the outer ring as it is already quite heavily chamfered. It is sized for 58.55 mm baskets, scale accordingly for different sizes (maybe print only the outer ring first, check the fit on the basket and scale+reprint if needed). The spacers are sized in millimeters of thickness, i.e. from 1.5 to 3.0 mm.</p>