Unusual 'ridges' in laser engraved areas

[MicFarlow]

Hi All,

I have a chinese 700x500 machine and I have noticed 'ridges' in the engraved area... attaching pictures of some in plywood and also plastic.

I am using the RDWorks plugin for CorelDraw and seem to have no issues with anything there. Have taken all the default settings.

Thoughts on cause?

I know the pictures kinda suck and it's hard to see but there are ridges in the engraved area running from right to left.


Maybe a little easier to see in the black areas of the engraving


Thanks in advance,

Mick

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