I'm strongly considering a Toolchanger. But the shopping is a bit confusing. Coming from an MK3S, I think I want direct drive extruders? Are the top of the line extruders then the Hemera? What would be the total shopping list for a Toolchanger with Hemera extruders? The Toolchanger has a glass surface? I'm not used to that either, I might want a PEI sheet, but I guess that wouldn't be from E3D?