Metal adapters for the Slow Feeder Metal. Our original adapters were 3D printed. These are the metal upgrade, machined for a precise, solid fit and a finish that matches the Slow Feeder Metal. Compatible grinders Weber Workshops EG-1 Option-O Lagom 01 Choose your grinder and your color above. Each adapter is made to fit that specific grinder opening. Black or silver Pick the finish that best matches your grinder and your Slow Feeder. Both are the same adapter, just a different color. Already have the 3D printed adapter? This metal version is a direct upgrade. It installs the same way and gives you a sturdier, cleaner connection.