Which is the best file for the thc setup and troubleshooting?
I like this one
I’d be tempted to use the straight line cut feature and observe it over a long cut.
Both observing that voltage fire controls is registering and through your shield the action of the z up and down.
Some smaller geometry the THC doesn’t really even have time to turn on and do anything before it moves on to the next piece of geometry.
I like this suggestion with the workpiece shimmed at the far end so that THC has to lift the torch to maintain constant cut height. This will provide a simple proof that THC is working, then any problems you find in actual cutting will be second order problems.