CTC Replicator 1 (Dual) Clone RFI problems

Occasionally the display on this printer becomes garbled and the reset has to be pressed. I also noticed that when this printer is on it affects the speed of my fibre to the cabinet FTTC broadband. As a licensed Radio Ham I did notice that there was little or no RFI (Radio Frequency Interference) filtering at the mains input or any ferrite sleeves over wires going to the motors and thermocouples etc. I think that the switchmode power supply is probably causing RFI to be transmitted along the mains and then it's being picked up by the telephone line so reducing the broadband speed. I will retrofit filters and ferrite's to reduce the noise made by this machine. The graph below shows the slowing effect of this printer on my broadband speed.

I have since moved my printer to another room away from the telephone line until I get it filtered better.
WARNING! modifications to your machine may damage it or cause a FIRE! you have been warned. Be CAREFUL with Hot things like your printer!