Can electronics be damaged by plugging into a lighting dimmer circuit?
Most typical SMPS (switch mode power supply) should be totally fine with under voltage or chopped up input. When the input voltage or current is below what is required they simply shuts down or fail to start

One of the big design wins with a SMPS is that there is very little relationship between input voltage and waveform, and out voltage and waveform. So this generally protects sensitive electronic circuitry for all manner of bad input into the SMPS

Most devices (including laser printers) generate any high voltages they need from after the SMPS too, so these should not be a problem either. This is to make the high voltage controllable and the device useful around the world on the different global voltages