ma to stl conversion represents export of Autodesk Maya content (.ma) to STL format for 3D printing or similar purposes. The typical workaround is to export .ma to .obj and finally export these files as .stl file, trial version fo Maya might be enough for this actually.
Might be also doable in some 3D modeling tools, provided they support MA format directly or at least there is option to add plugin that does.
Updated: August 23, 2023