In a recent thread (https://forum.e3d-online.com/index.php?threads/well-no-big-box-for-me-then.1900/) someone brought up the CoreXY principle ( http://corexy.com/theory.html ). Of course little me hadn't heard of it but I think it's super interesting. Despite spent many hours looking at the clever ultimaker design which allows the moving parts to be very light, it never occurred that there might be a solution involving belts. Does anyone have any experience of this? What are the disadvantages of CoreXY?