I've had good luck with changing the printer settings in the HP1220c to print in black. Don't use the black print selectioin in plotmaker.
For mixed colour and black images I prefer to set the drawing settings to print in black in each individual drawing. Works the best and keeps my colour log intact. Then if I want all black prints I simply change the printer settings.
Intel i7-6700@3.4GHz 16g
GeForce GTX 745 4g HP Pavilion 25xw
Windows 10 Archicad 26 USA Full