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Hi scalesr1

welcome to the collective !!!!

which 3040 machine do you have ?
different manufactures use a variety of electronics
some good others you upgrade / replace very soon

2D and 3D...

A downcut spiral is what you want to use.

You could use a ramped profile with very shallow DOC to mark the slot to around 2mm depth prior to cutting it, a bit like using a marking knife in conventional woodwork to prevent torn surface edges...

Hi,



marks at the bottom are usually caused by misalignment of the spindle (not exactly perpendicular to the machine base).



If wood tears out the tool is usually just not sharp enough....