I'm sorry if this has been addressed already, but I didn't see it when I just tried searching. I've added a chimera and 4 bowden extruders to my printer and had originally planned on using the original Duet with the expansion board. When this latest generation came out, I was told that it could be expanded without the need for adding a second board. But I've not been able to find anything concretely stating this online. If anyone can clarify this for me, it would be much appreciated. I'm trying to build a highly capable high capacity FDM printer to go along with a smaller capacity, high detail DLP printer build. Previously, I thought the Duet w/ expansion board was the best of the best for quad extruders. Now this new board looks even more incredible. Especially so if it doesn't require the expansion board - as that's what has prevented me from being able to finish it already (I simply didn't have the budget to be able to swing it). Any and all help is greatly appreciated.