Jackso is asking how to scale the features seperately, so that they can scale the inside of the 0 down and the outside up. If it were a 2D CAD file that is being extruded, you can use the Offset feature on each line to move it inward or outward as needed before re-extruding the model in the software. If it's saved as a STEP or other feature-based format, you might be able to go in and re-scale features independently, depending on what modeling package you have.

Unfortunately, it's most likely an stl file, which is interpreted as a single piece without defining ends or beginnings of discrete features, in which case, your best bet is to trace over it to make a new object.