Measurement in the virtual space can be considered arbitrary; what matters is the relative scale. When a model is created by 123D Catch, the size of the object is measured in an arbitrary scale of units. These units can then be interpolated by other 3D modeling programs using metric or imperial units of measurement. We can see how Meshmixer interpolates the size of the pyramid in the following image:

The pyramid measures roughly 23 x 17 x 33 millimeters. In reality, the pyramid is more than 4 meters high. What is important for us is a scale that will print on our 3D printer.

In this recipe, we'll learn how to scale our model for printing with Meshmixer.