How to make honeycomb (flat hexagonal grid):
Make a cube with such parameters:
Select two long edges on a top face:
Cut it by 3:
Connect vertices:
Leave selected these two vertices:
...and delete it:
Select two long side faces:
"Extrude" it by normal for 0.5 unit:
Select two these edge loops:
"Dissolve [RMB]" it (thanks micheus!)
Base unit is ready:
It can be "mirrored" by the side faces to the required size and cleaned up from unnecessary edges:
You can use it to make a desired structure - see above for how-to.
Make a cube with such parameters:
Select two long edges on a top face:
Cut it by 3:
Connect vertices:
Leave selected these two vertices:
...and delete it:
Select two long side faces:
"Extrude" it by normal for 0.5 unit:
Select two these edge loops:
"Dissolve [RMB]" it (thanks micheus!)
Base unit is ready:
It can be "mirrored" by the side faces to the required size and cleaned up from unnecessary edges:
You can use it to make a desired structure - see above for how-to.