STL File Creation for Prototype

I'm looking for an expert who can convert my existing product model into a 3D printable STL file. I have a full size version of the product for you to work from but am looking for a smaller version for sales people to take round with them to show customers. The product can be seen on our website https://www.redwood-uk.com/brands/eco-crates/ it is the grey crate that we are looking for

Ideal Skills:
- 3D Modeling
- STL File Creation
- 3D Printing Knowledge
- CAD Software Proficiency

I need a freelancer who can ensure the STL file is optimized for 3D printing. If you have experience in this area, I look forward to your bid.