Your browser does not seem to support JavaScript. As a result, your viewing experience will be diminished, and you have been placed in read-only mode.
Please download a browser that supports JavaScript, or enable it if it's disabled (i.e. NoScript).
Switch from bang bang to PID. You can alter the PWM frequency as well if it's still too rapid.
https://duet3d.dozuki.com/Wiki/Connecting_and_configuring_a_chamber_heater https://duet3d.dozuki.com/Wiki/Tuning_the_heater_temperature_control