The ornamental design for a three-dimensional printer frame, as shown and described.
FIG. 1 is a front perspective view of a design for a three-dimensional printer frame.
FIG. 2 is a right side view of the design.
FIG. 3 is a left side view of the design.
FIG. 4 is a front view of the design.
FIG. 5 is a back view of the design.
FIG. 6 is a top view of the design; and,
FIG. 7 is a bottom view of the design.
The broken lines showing portions of the three-dimensional printer frame depict environmental subject matter, are for illustrative purposes only and form no part of the claimed design.