I already have the part modeled in an STL that came out of Blender, and now I need it available as a native Rhino 3DM so I can send it straight to my 3D printer. No design tweaks are required—this is a direct, one-to-one conversion, and basic detail is perfectly fine. If the mesh doesn’t import cleanly, feel free to rebuild the geometry natively in Rhino; accuracy to the existing shape is the only priority. Please return a single, watertight 3DM file that opens without errors and keeps the original scale. A quick turnaround is appreciated, as it’s a small, straightforward job.