Lightly grease a 9"x13" pan. In a large skillet with a lid over medium heat, simmer meatballs with 1 c. marinara sauce until meatballs are tender, stirring occasionally. Cook pasta according to package directions. Drain. Arrange meatballs in bottom of pan. Spread pasta over the top. Spread remaining 1 1/2 c. marinara (or more, as desired) sauce over the pasta. Use your hands to flatten ricotta, then piece it together over the sauce. Top with 1/4 c. parmesan. Sprinkle with mozzarella cheese. Cover with foil and bake for 30 minutes. The last five minutes before it's done, remove the foil and sprinkle with more parmesan cheese, if desired. Serve immediately.