STL Scans to STEP Conversion

I have two small 3D scans of an engine bar from an older car and they’re both in STL format. I need them turned into clean, watertight STEP files that I can send straight to suppliers without further tweaking. The geometry is fairly simple and is only for location on battery boxes

If you’ve handled STL-to-STEP work before and you’re confident you can deliver quickly, let me know about similar projects you’ve completed and the tools you’ll be using. I’d like the finished STEP files as soon as possible, so please confirm your earliest delivery date along with any questions you need answered before starting.