We regret that you can't repair STL's with MiniMagics. Magics RP however does allows you to repair STL's.
To obtain Magics RP, please have a look at "How to get Magics RP?".
There are two ways to fix your part. You can either use Magics RP or the STLfix service.
Magics RP provides unmatched capability to interact directly on defective triangles, allowing you to create a watertight STL file in a matter of minutes. The Fix Wizard automates the repair of your STL model, which reduces the skill level and time required to repair files. Its intuitive interface quickly identifies errors and recommends the best next step for correcting them.
All defects can also be repaired manually. Magics RP allows the user to invert flipped triangles and shells, stitch bad edges, and smoothly fill the most complex holes. Double surfaces can be detected easily, identical triangles can be removed and separate parts or shells can be merged to obtain a single-shell part.