I have never seen RepRap firmware. All of my experiences have been with the Marlin. But now There is a way to apply the RepRap firmware to the SKR and other mainboards. Anybody here with experience with both that can tell me which is better and easier to use and gets better results and is faster and all that good stuff? Check out this video, guys: https://www.youtube.com/watch?v=Mw-Gg3y__Go