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And I think you'll find a setting in windows somewhere to change the default file format for vcarve.

Have you tried just changing the
file extension to txt from nc? Windows will raise a warning, just ignore it.

I would suggest checking the brushes first, also take a look at the commutator to check for wear.

If it's burning, then RPM is too high, or feedrate is too low. Either causes excess heat, which dulls tools faster.
I'd make 2 passes at 6mm per pass, too.

I've been using one of these for a few years. It's taken a lot of abuse in that time and just keeps on working. If it breaks, I'll be getting another one. However, the noise is one reason I use ear...