@taylo708 That could be an option. You may be able to PID tune the chamber heater to solve the temp oscillations and use a switching frequency slow enough that it won't hurt the mechanical relay. FW 3.2 has a new heater tuning algorithm that may handle slow heaters better, but the tuning process can take a while. You can also try and derive your own PID values to use.
https://duet3d.dozuki.com/Wiki/Connecting_and_configuring_a_chamber_heater
https://duet3d.dozuki.com/Wiki/Tuning_the_heater_temperature_control