Given a loose tube rattling around in the back, it should be awful.
With that snugged down, the results look pretty good and we’re quibbling about details.
The scan interval depends on the width of the surface damage in the target: 0.15 mm is an itsy too wide for the grayscale material, but might work fine in a different material.
At some point you should explore Dot Width Correction for images; I don’t have a lot of experience, but it’s apparently the ticket for crisping up the contrast: