I designed these for my FolgerTech Prusa i3 2020, to allow use of new aluminum carriage (RepRapChampion) and bed upgrade with different bearing carriers. The stock mounts were too tall, shortening up the y axis travel. Initially printed in PLA, to test fit and operation, then reprinted in ABS. Suggested print settings .25-.3mm layer height, 3 walls thick on all sides, 40% infill. The holes will have to be drilled slightly for an exact fit.