Insert for attaching honeycombs to the wall with empty fastener.
UPDATE 14.12.2023
According to @Molot suggestion, I added model variants that can be printed without supports. See files: insert-countersunk-empty-no-supports.stl and insert-countersunk-empty-no-supports-no-latches.stl.
UPDATE 11.08.2023
If you need some modified insert with different hole diameter, bottom thickness or even hole shifting (in case you drill hole not accurate), you can use Updated OpenSCAD library for HSW attachments.
The author remixed this model.
Add insert for attaching honeycombs to thw wall with empty fastener.