Dremeling in copper is disc consuming. Wearing of those discs is great. Also, controlling the cut to be straight is not-so-easy. The diameter of the discs don't allow you to cut the connections between the last row and column (outer 'rim' of holes) without hurting the area without holes (outer full copper space), as #Rotor explained. I tried to make it with 1.2 and 1.5 mm mill bit, but I'm not so satisfied with the result.
Here:
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