A brewer machine for preparing beverages, the brewer machine comprising: a housing; and a brew chamber unit supported by the housing, the brew chamber unit configured to receive a flow of liquid from a liquid source during a beverage preparation operation, the brew chamber unit comprising: a first body portion having a chamber configured to receive a first beverage pod, the first beverage pod having a first diameter; a second body portion having a chamber configured to receive a second beverage pod, the second beverage pod having a second diameter that is less than the first diameter; the second body portion being disposed at least partly in the chamber of the first body portion, the second body portion configured to move relative to the first body portion in a direction generally parallel with an axial axis of the brew chamber unit; a lid configured to attach to the first body portion; characterized in that the brew chamber unit further comprises a spring disposed in the chamber of the first body portion and configured to be compressed between the first body portion and the second body portion; and the brewer machine is configured such that: when the first beverage pod is received in the chamber of the first body portion, the second body portion is moved downward into the first body portion against the bias of the spring; when the first beverage pod is removed from the chamber of the first body portion, the second body portion is moved upward by bias of the spring. a housing; and a brew chamber unit supported by the housing, the brew chamber unit configured to receive a flow of liquid from a liquid source during a beverage preparation operation, the brew chamber unit comprising: a first body portion having a chamber configured to receive a first beverage pod, the first beverage pod having a first diameter; a second body portion having a chamber configured to receive a second beverage pod, the second beverage pod having a second diameter that is less than the first diameter; the second body portion being disposed at least partly in the chamber of the first body portion, the second body portion configured to move relative to the first body portion in a direction generally parallel with an axial axis of the brew chamber unit; a lid configured to attach to the first body portion; characterized in that the brew chamber unit further comprises a spring disposed in the chamber of the first body portion and configured to be compressed between the first body portion and the second body portion; and the brewer machine is configured such that: when the first beverage pod is received in the chamber of the first body portion, the second body portion is moved downward into the first body portion against the bias of the spring; when the first beverage pod is removed from the chamber of the first body portion, the second body portion is moved upward by bias of the spring. a first body portion having a chamber configured to receive a first beverage pod, the first beverage pod having a first diameter; a second body portion having a chamber configured to receive a second beverage pod, the second beverage pod having a second diameter that is less than the first diameter; the second body portion being disposed at least partly in the chamber of the first body portion, the second body portion configured to move relative to the first body portion in a direction generally parallel with an axial axis of the brew chamber unit; a lid configured to attach to the first body portion; characterized in that the brew chamber unit further comprises a spring disposed in the chamber of the first body portion and configured to be compressed between the first body portion and the second body portion; and the brewer machine is configured such that: when the first beverage pod is received in the chamber of the first body portion, the second body portion is moved downward into the first body portion against the bias of the spring; when the first beverage pod is removed from the chamber of the first body portion, the second body portion is moved upward by bias of the spring. when the first beverage pod is received in the chamber of the first body portion, the second body portion is moved downward into the first body portion against the bias of the spring; when the first beverage pod is removed from the chamber of the first body portion, the second body portion is moved upward by bias of the spring.