Hope this article helps.
@xchrisd and I got this fixed for @Steener. It wasnât the probe. The converters were swapped and it started working.
It is difficult to say this is a user fault or a manufacturer one.
It is not sure, the converters should be the same.
Obviously they arenât 
FWIW, I printed out quick release backplates for the modules from https://www.thingiverse.com/thing:4696584. Now if the unit decides to crash into the bed it simply pushed the module up and out of harms way. Happened to me with the laser module once when I was testing out Lightburn. The head drove into the bed and pushed the module up.
do you worry about wiggle / variation etc for 3d prints or does it seem to not be an issue?
Doesnât seem to be an issue, the modules are fitted in very tightly in the X and Y axis, and since they never touch (in theory ) the part or bed the Z axis is fine.