Exporting particular data points of simulations from ltspice
You can use the .meas commands for that. Suppose V(x) is the waveform of interest, and you're interested in time=1m:

.meas tmp param V(x) at 1m


After the simulation is done, activate the schematic window and press Ctrl+L to bring up the error log. Right-click inside it and choose Plot .step'ed .meas data. The newly opened window will have the variation of the voltage as the parameter was changed. Here's an example:



If you need exporting, right-click inside the .meas plot window and then, from the File &gt; Export data as text.