I added a secondary optional Z axis plate with a hole patter for the Chinese 52 mm diameter 300W 48V ER11 collect 3000 to 12000 rpm spindle. This plate was added into the 6mm kerf compensated nesting autocad file. As a result the plate got 20mm larger reducing the potential Z axis movement range by 20mm. The mounting pattern for the spindle is 20x70mm hole patter taking M6 bolts. On the picture the yellow stuff is "behind" the z axis plate and the red thing is this new optional spindle mount.