Hello Stulli,
It is possible to connect the ground and +12V wires of 2 SMPS2Dynamixel in order to power the hole Poppy with a single power unit pluged to one of the two SMPS2Dynamixel. That’s why on the video you see the operator cutting the wires corresponding to the data, leaving only the 2 wires that connect the +12 V and ground… but, do not connect the 2 SMPS2Dynamixel with a 3pt cable !
And yes, you can plug the 2 USB2AX to the RPi4 and use the new version of the software v3.
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