Many 3D modeling tools nowadays support formats from Autodesk Inventor, so achieving ipt to stl conversion, i.e.
export of Inventor parts for 3D print is certainly doable. If you do not have accesss to Autodesk Inventor, you have to rely on alternative products or dedicated 3D modeling conversion tools, some of them can be even used for free.Open IPT file Open STL file
Autodesk Inventor is modeling application used to create 3D digital prototypes
An online CAD conversion service
A CAD visualizaton, analyzation and translating system