Being a “bedslinger”, the A1 printer needs to have room in front and behind for the bed to move without restriction. If you have a small bench or other objects that need to be around your 3D printer it's important that it stay in an “exact” position. If you or anyone else has to move it for any reason, it's important to put it back in the same position. One of these brackets at each corner “saves” a place for the printer.