Machining-Ready STEP Conversion

I have a finished part modeled in Blender that now has to go on a CNC mill, so I need the file converted to a clean, solid-body STEP (.stp). I will supply the original .blend file

Your task is to translate the geometry accurately, verify scale in millimetres, repair any non-manifold edges or open faces that would prevent the solid from importing cleanly into Fusion 360 or SolidWorks, and return a machining-ready .stp.

Deliverables
• One watertight .stp that opens as a single solid body
• Brief report noting any fixes or deviations required to meet the supplied tolerance sheet

If the file loads without errors on my side and the key dimensions check out, the job is done.