After I get my DT, I’d like to redesign the OEM EXT board with a few variations. One of them being a version with internal USB port like @TinaStormcaller is describing.
The other thing I’d like to redesign is moving the motor drivers (mosfets or transistors I think) for the printer to their own separate board. If the motor drivers components were removed then the connector for the printer could also function as a general-purpose ext connector with nearly the same pins as I designed in the Ext breakout.
I think the OEM EXT board should really be called the Printer EXT board. I think we’ll need an EXT board that preserves speakers and USB while also properly breaks out GPIO pins for tinkering or other modules that aren’t a printer.