Fusion 360 - A Rectangular Hexagonal pattern from a Equilateral triangle, or Put Holes in Part.
Workflow on a triangle pattern within a rectangle face.
0:00 Intro
1:15 Create the part
1:32 Sketch first cut
4:07 Extrude first cut
4:21 Rectangular pattern first row
5:04 Adjust dimensions to center pattern
6:05 Rectangular more rows using sqrt(3)
7:16 Adjust dimensions to center pattern
8:02 Rectangular pattern first cut in second row
8:35 Rectangular pattern second row
8:55 Rectangular pattern the last rows
9:18 Done