A second version of a queen-excluder. After reading about the several versions I thought it might be helpful to have less holes, in order to keep a better temperature control by the bees in colder times.
The holes are slightly wider now at 4.3 mm, because I observed several bees getting stuck and die in the earlier version which was 4.1 mm
Since the queen is most of the time in the center of the hive, there is no need for holes there, so they are mainly placed at the sides and front and back, until 2 frames inwards.
This is one half excluder, so 2 are needed to cover a full Langstroth hive with 8 frames