STL to STEP Conversion

I have four finished 3D models in .STL format that I need translated directly into .STEP, strictly one-to-one—no editing, healing, or redesign. Each source file is under 200 MB, which is the upper limit my CNC workflow can accept, so the resulting .STEP files must stay within that size range as well. These parts are for a prototyping run on a milling machine, so dimensional fidelity is critical.

Deliverables
• 4 .STEP files converted from the supplied .STL models
• A simple verification sheet or screenshots confirming dimensions and details match the originals

That’s the whole scope—clean, accurate, ready-to-mill files and a quick confirmation they’re identical to the inputs.