This is a calibration print done with a Chimera hot end. The copper filament prints fine. Then, it switches to the gold filament, and the copper filament oozes, causing the rat's nest on the left side of the print. When it goes back to printing in copper, the gold filament oozes. What settings should I be using for retraction, and retraction on toolchange? Is it necessary to drop the temperature on the inactive hot end, and then wait for it to come back up to temp later?