Steel thumb bolt -- bolt plug remix for no supports

This is a tiny modification to the bolt plug from Zach's real steel bolt and nut for Articulating Raspberry Pi Camera Mount model, to allow the bolt plug to be printed without supports.

I removed a small part of the bolt plug interior fitting so the interior hole overhang would print in two layers using layered bridges, instead of a whole layer all at once with overhanging round extrusions.

The slicer screenshots are the part viewed from underneath. The cover photo is the printed part flipped over after printing.