Many thanks for offering assistance, but I have found the source of the problem. It is the infamous Sintron probe. Having fitted the ED3 the fins are wider, and these interfere with the spring. This prevents silky smooth bounces, and that means the microswitch doesn't open/close reliably.
Having managed to get it working temporarily I worked my way through the entire configuration again, and ran the Escher system, and got 0.2. When it is printing properly it prints on the bed as it should do.
I now need to resolve the probe issue, which will take a bit of work, or remove the microswitch, mount it on a swivel arm at the bottom, and dispense with the allen key altogether. Will just need to reverse the polarity on the signal in Marlin.
Having managed to get it working temporarily I worked my way through the entire configuration again, and ran the Escher system, and got 0.2. When it is printing properly it prints on the bed as it should do.
I now need to resolve the probe issue, which will take a bit of work, or remove the microswitch, mount it on a swivel arm at the bottom, and dispense with the allen key altogether. Will just need to reverse the polarity on the signal in Marlin.