Hello all I need to find out how to align and merge two separate STL files together a single part.

Can I do it in mesh mixer?

Hi @fits yes, Meshmixer can do it (it’s kinda in the name!), though personally I find its interface a little awkward to use. If all you want to do is combine two STLs I’d recommend Microsoft’s 3D Builder, it’s free from MS’s app store. It’s a pretty simple program but it carries out combine functions well in my experience and is an intuitive user interface.

Failing that I’d recommend Autodesk 123Design, though this is no longer available from Autodesk so you’ll have to search the web for an old copy to download (and take care you don’t get something infected).