The Technical University of Ilmenau does not charge general tuition fees. The only fee currently required is a semester fee of approximately €270. This semester fee includes the semester ticket, which allows you to ride regional trains within Thuringia for free. You can find more information about the semester fee here.
The cost of living in Ilmenau is much lower than in a major city. The various options for financing your studies include, among others:
BAföG, student loans, or scholarships, for example
In addition, during your studies you can apply for a position as a student assistant (HiWi) at the university or look for a part-time job at one of the many companies located around the campus. This way, you can not only finance your studies but also gain valuable practical experience.