The strain gauge in the Duet3D smart effector is susceptible to changes in magnetic flux, dB/dt. Specifically, the bed heater under thermostatic control, and I suspect to a lesser extent the local hotend heater. ( This is not the magnetic ball susceptibility due to Hall-effect on various electronic devices. )
The lack of magnetic immunity causes programming of the bed levelling and compensation routines to halt thermostatic control of the both a heated bed, as well as the hot-end. While the bed is probed, these devices are in the off-state. This then causes the temperature to drift, cooling. I have not quantified the dimensional shift imparted by this thermal transient. I have however wished to overcome the delay required to re-heat the devices in the overall multi-step routine.
I have analysed and simulated the necessary update(s) to the SE, which were pulled from the Github. I have generated a report/presentation on the needed, minor updates to achieve a greatly improved magnetic immunity. This forum is possibly not the correct place for such a document.
I would like to deliver to the designers of the SE this report such that its findings might be incorporated in the next revision of the SE. I have applied best practices for strain gauge as well as my knowledge of magnetic susceptibility to achieve a much improved device.
A little of my background. My professional career is currently focused on the simulation of electro-magnetics. Currently, I am employed as an engineer in MRI industry, developing next generation medical devices and the MRI system itself, which must be capable of functioning in the highly stressful MRI environment. I have at my disposal very large compute GPU clusters, which were employed in the simulation of a virtual SE.