Hey guys, this is the answer. We’ve been through these discussions with the X series too. The problem is the power is used different ways in the printer. Some goes through the power supply which probably can be set to 120 or 240V or may just not care.
The problem is the heaters. They are spec’ed for the target voltage and have to be replaced if changing what voltage you want to run on. Try to run a 120V heater on 240V and you may kill it due to the 4x increase in power. If going the other way, from 240V to 120V, the bed/nozzle/etc heating is down by a factor of four.
Most switching power supplies can run off 120V or 240V with no problem. It’s the heaters that trip things up.