Most coffee aficionados will tell you that grinding your own beans is the secret to making a perfect drink at home. It's true that grinding the coffee right before brewing it makes for a fresher, better-tasting beverage, but not all freshly ground coffee is alike. The model simulated how ground coffee and water interact in the cylindrical basket of an espresso machine. Coffee shops often grind beans on the finer side, assuming that the increased surface area of the grounds will yield a stronger drink. Super-fine coffee is more likely to clump together and clog the cylinder, making for a less efficient brew.