Laser printers have a brief need for a very high amount of electrical power while heating the printing element. That has improved a lot, but was the basis for my comment that the lights would dim when using a laser printer in the past. Maybe the lights and plugs were on the same circuit, which is not up to code.
The lights dimming is bad news - but all the more reason to not run computer on that circuit, or run them with a UPS/power conditioner.The lights dimming typically indicate a low voltage in the circuit or high amperage in another segment.
.... That suction needs a surge from the grid, so there could be a conflict between the printer and a surge protector, even though a small printer and healthy surge protector should be fine.
The purpose of the power conditioning is to add or reduce voltage downstream so that the resultant output power is in range. They work until they don't - and then they don't ever again.
