I already have performed Mesh to NURB and it spits out an error stating that the export type does not support a polygon mesh. Now, i have tried reducing the mesh by 90% and no such luck. I really need to get this STL to STEP and i have tried 3 different softwares now. Any insight would be greatly appreciated. This might be a unique issue because i am exporting the STL from a design topology software and the STEP file, if converted would be quite large.