[PicassoCTs]

Max resolution are the steps of the stepper motor per activation. (1.8° step-angle) https://datasheetspdf.com/pdf/1260602/Schneider/NEMA17/1

It could be increased by adding multiple distance measurement sensors in parallel per scan direction.

It could also be made more precise by adding a "sub-gear" that only turns within the frame of the step. But this would lengthen the scan process considerably.

To shorten that again, one could add the same scan head into the opposite direction.

At the moment the resolution is depending on the distance from the scanning device. Meaning the larger the distance, the more the angling distributes the points on a surface.

There are no real ways to mitigate that with a stationary device. Density can be improved though with rescans, using the noise to increase, although there the noise blurs the points along the line to the degree.

[dekhn]

Stepper motors can be microstepped (typically up to 1/32 or 1/64). In my experience, this works poorly as the microsteps are not evenly spaced. I find gearing works better.