MakerBot Print is our newest print-prepration software, which supports native CAD files and STL assemblies,
allows you to interact with all your printers via the Cloud, and many other exciting new features.
It should accommodate a rod that is a maximum of about 24mm diameter. The 3/4" designation is essentially the inside diameter of EMT, and the outside dimension is larger (0.922 inch +/- 0.005 or around 23.42mm). There may be some extra wiggle room with a 19.5mm rod, though you could scale it down a bit in your slicer to get a tighter fit.