Smart effector triggering and sensitivity

[TwoTone]

@dc42 This is the bed heater.

Thk

[dc42]

@TwoTone thanks, looks like it uses a spiral element, which (unlike the usual zigzag elements) will indeed generate a large magnetic field.

[TwoTone]

@dc42 Thanks again for all the support.
Worked perfectly with bed off.

[TwoTone]

@TwoTone David, after a good calibration, if nothing changes what do you think would cause the probe to not trigger.
We printed a pretty good layer test after a good calibration. See image.
The next night went to calibrate and on the first point it didn't trigger and pushed the hotend into the bed. Nothing had changed.

Ran a calibration again tonight, worked perfectly twice.

Tried a third time and same thing, first point didn't trigger.

Bed cold.

[dc42]

@TwoTone most likely you have an intermittent connection between the Smart Effector and the Duet. If the green LED flashes when the nozzle makes contact, the output signal line has become disconnected. If it doesn't flash then +3.3V or GND has become disconnected.

Also check that you have set the probing speed correctly, because probing very slowly could result in failure to trigger.