Formlabs might want to consider 3MF, since the additive manufacturing industry is in the process of replacing STL with 3MF - an extensible, open source, unambiguous language for representing geometry, but without the complexity of CAD formats like STEP.
SolidWorks, Catia, NetFabb and many others are now, or are rapidly becoming able to, import and export 3MF… Take a look at the 3MF consortium http://3mf.io/ for more about 3MF and the consortium which is developing it.