Scale and Measuring

I created a part (metric) in Inventor... a simple cube 25mm^3... exported to a .stl file. Opened .stl in Repetier. I noticed the part was a lot smaller than originally made. I increased the scale (x5) and printed. When it printed it was about half the size i wanted it (about 12mm^3).

Is there a measuring tape inside Repetier?or do I trail and error print until I fully understand my printer software?

 

This may be a problem with Inventor. I am not sure if there is an option to save it geometrically or something. You could also try Cura instead of Repetier and see what happens.

 

Check what units you export the stl at