The ornamental design for a mini-chamber, as shown and described.
FIG. 1 is a side view of the mini-chamber of one embodiment of the
invention and the dotted lines are for environmental purpose only and form
no part of the claimed design.
FIG. 2 is a perspective view of the mini-chamber of FIG. 1.
FIG. 3 is a first end view of the mini-chamber of FIG. 1; and,
FIG. 4 is an opposing end view of the mini-chamber of FIG. 1.