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both!

Think about where the tip of the cutter will be when cutting...it'll be about 200mm below the y-axis (depending on how much y-axis clearance over the workpiece you want. So any sideways...

Hi Monk,

Firstly just looking at the section sizes, given that it will be 1200mm long, would seem a reasonable start. It will depend on how far down the cutting is taking place away from this...