Using a nail filer in a dream signifies the desire to order our lives. It often has to do with finding out what is wrong and taking care of it in your own life.
If your nail filer is dirty, broken or blunt. You may be feeling like your life is out of balance and needs order restored. You are missing things that are important to you or you have neglected responsibilities in your life such as cleaning, grooming, cooking etc.
If you use a nail filer in a dream to scrape off something that was blocking the opening or penetrating it from the outside. You may be feeling blocked from something important in life such as a relationship, job, or opportunity.
Lastly, dreaming about a nail filer can signify that you need to get your own nails trimmed. It can also represent a sense of pride in the self, an increased sense of responsibility or taking care of the self.