Enable active temperature control
When printing with multiple materials, only one extruder
is active at a given time. Active temperature control
is specifically designed to avoid material to degrade
and ooze from idle extruders. The idle extruder is
dynamically cooled down and heated during printing,
such that it is ready when needed and cooled when
not needed. Adjust extruder parameters
idle_extruder_temp_degree_c and extruder_degrees_per_sec
when using this feature.