**For me i started by creating the base first then i added the threaded part

Step 1:SolidWorks(Before && After Adding thread part)



Before Adding thread part After Adding thread part
ll ll
ff ff



Step 2:Save as STL file(Before && After Adding thread part)



Before Adding thread part After Adding thread part
ll
ff


Errors in printing: The 2 parts dont fit in each other




ll
ff