Hello there! My name is Kalp and I'm the founder of KALP, a company that provides Cad Cam Cae services from past 10 years. We have an employees with good reputation who can provide you with the edited file for your STL solid quickly and efficiently. We specialize in providing quality services and are ten year old company.
We understand that you're looking for someone to mirror the right side of your STL solid so that both sides look the same. Unfortunately, I'm too stupid for that myself so I was wondering if you'd be interested in us taking a look at this? We have experienced employees who are familiar with most CAD softwares such as Autodesk, Solidworks, Pro e, Creo and Asys which could be used to complete the job quickly and accurately.