I had a nice long technical answer ready for posting, then accidentally closed the window.
It you have only one setting it is probably a 'square' setting, both DPI and LPI together. The ULS driver has them available separately, I almost always use it as a square setting anyway.
In your case 600 DPI will take twice as long to engrave than 300 DPI. Try both as a test and see if you think there is a difference in output. Some materials will show quite a difference, some (like wood) will not.
A laser spot is basically round. A .003 spot at 333 DPI will have the pulses touch only on the left/right and the up/down edges and leave 12.5% of the surface untouched. That is why overlap is necessary.
Also picture the edge of a row of touching circles, very uneven. Then superimpose that same row shifted 1/2 of a circle off center. A much smoother edge.
Philadelphia, PA (Really Bensalem)
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