Repair/modify an existing .stl file or two with geometry errors to make two 3D printable objects - both small & separate but designed in tandem

Please have a look at the two attached files. They will give you the best idea of what is needed. The longer one is of relatively simple geometric shape, it is solid and may or may not need repairs. I have been told that it is already 3d printable. The more conical shaped object looks fairly geometrically simple on the surface, but it is largely hollow with three open "slits" in its side for accessing the hollow core. It is meant to be this way, but there are geometry flaws with the file that need fixing before it can be 3d printed. Along with these printability fixes, it needs to be sized/scaled to align/fit/work with the first file described above. Finally, I am looking for someone who ALSO has the ability to 3d print the objects upon completion.