Converting Mesh to Solid

[peysera]

Hi all! I'm fairly new to 3D printing, but I work as a Draftsman for a mechanical company. I use Autocad inventor, so this is what I mainly use for all my drawing and design work.

I'm not familiar with Mesh at all, and ive got a drawing I need converted to a solid so I can Edit it and 3D print it. I have attached it to this post. Ideally I need it in either STEP, DXF or a solid works part file would be fine.

Any help on how I can easily achieve this with the program I have would be greatly appreciated.

Thanks,
Austin