I like my tool changer. I don't like how noisy it is. I have a BigBox with TMC 2208s on the Rumba card and Klipper running on a Pi 3B and it is quiet and supports scripting to control the printer and a video camera to watch it remotely. So I am thinking of Duet 3. Since it is about a $500 US upgrade, I am wondering if there is a way to sell my slightly used Duet wifi and Duex cards (I wish I could just upgrade the driver chips...) Does anyone know if there is a market for slightly used boards?