Hi Alex - MoI does not itself have a 2D print function - to get better control over printing you generally need to export to a CAD program that has print functions and then those programs will usually have a lot of controls for the scale and stuff like that.

A couple of programs that can work well for that are Rhino (http://www.rhino3d.com/) or also ViaCAD 2D is an inexpensive option: http://www.punchcad.com/c-12-consumer-cad.aspx

It can be possible to do it with some view capturing in MoI though as well - see this previous thread for some details on how to figure out how large in units the width of a screenshot is:
http://moi3d.com/forum/index.php?webtag=MOI&msg=4128.1

- Michael