OK, since I am an engineer by profession, I can't leave things alone. All this space at the end of the AGB100C HC has been bugging me. Great idea about stashing your strap there. But I didn't want it banging into the headstock. Took a look at the shape of the case and see that there is a taper that runs the length of the neck. Decide that I can design a little barrier to keep larger items at the far end away from the headstock.
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So I decided to grab my CAD and work something out.
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The flat bottom sits right on the bottom of the case cavity.
The sides are angled in to match the taper of the case, and sized to wedge in just on the far side of the headstock.
The curve is to give headstock clearance and to distribute any forces out to the sides.
Decided not to make a basin or cup occupying all the space. the little things can go in the proper storage area under the neck. This space is just to keep big stuff (strap, doo rag, etc) from sliding down the neck.
Took it to my 3D printer, tried to match the interior color, and printed away.
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This version is juuussst a little too tall. Will print another a few mm shorter.