i hear you mate but not the case here.
the whole house is on batteries behind dual inverters that doesnt flicker at all when the grid goes down
on top of that, the printer is in a room that has its own gel batteries backup and its on Victron inverter that is even higher quality and quicker than the main one, there is no situation that room has no power unless ALL the batteries ran out.
BUT, it could be a power supply issue on the actual printer side, maybe its power supply is bad and not working like it should , that is definetly possible, this may sound entitled but i feel i shouldnt be messing with this on a new machine.