This is a serious and genuine cry for help. - I have enjoyed my secondhand Mendel 90 very much. It has introduced me to 3D printing very effectively. - I would now like to move on to another used printer that would be an effective upgrade. Something enclosed and maybe auto bed leveling. Spools not cassette. - I do not have enough experience to make a really informed choice in order to move forward. Any helpful suggestions or opinions from experienced users gratefully received.