Rectangular Array of 3mm holes spaced 10mm on 12 x 24 board

[WillAdams (William Adams (Carbide 3D))]

https://old.reddit.com/r/shapeoko/comments/1pc148s/matrix_of_holes_using_carbide_create/

Use Linear Array:

Then center the group:

[WillAdams (William Adams (Carbide 3D))]

Then use a Drill toolpath (if you have a 3mm tool):

Use current selection

Or, use a Pocket Toolpath with a tool smaller than 3mm: