This replaces the stock supports, slightly beefier! I only made this because I was screwing around and broke mine, not really an upgrade. I do feel the included ones work fine. Tight fit, print with at least 3 perimeters, make sure your smooth rod gets fully seated into the center plate. Don't over tighten your m3 screws (a little too tight in the picture). If you broke yours slow your printer way down and you should be able to get a decent print.