Can i use 1st ODrive via USB, the rest of odrive connected via CANbus

as title

so we can save a USB2CAN adaptor

You don’t need a USB to CAN adapter per ODrive, you can connect multiple ODrives to the same CAN bus.

i mean use the first Odrvie as a USB2CAN adapter meanwhile…

No, you cannot use ODrive as a USB to CAN adapter.
Get one of these: https://www.inno-maker.com/product/usb-can/ they are very good.

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