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Hello,

I'm trying to reconstruct the all-electron local potential to a fine-FFT grid (in simulations using the PAW method). Does VASP 6 have a built-in implementation of this? Functionally, I'm hoping there's an equivalent to the LAECHG tag for generating an all-electron form of the LOCPOT file.

For context - I want to use the all-electron potential for simulating electron microscopy scans, which requires an accurate potential near nuclei.

We don't have this feature currently implemented in VASP. It should, in principle, be possible to do it.
Certainly, one difficulty will be that a very dense FFT real space grid is required to represent the AE potential.

From your question what I understand is that you would like to have Eq. 41 from https://doi.org/10.1103/PhysRevB.50.17953 written on a regular FFT grid.
If not then maybe you could write down the formula or refer to an equation in the literature.
We can add this to our feature request list.