Wham Bam Resin Hotbox USB Extender dummy plug

I recently got Wham Bam Systems' “Resin Hotbox”. It has a usb extender that mounts in the front facing, but with it installed, it can't be folded up nicely, and without it there's just a hole.

Since I won't need it at all in my setup, I just left it off and went looking for something to close up this hole with.

I took @Bryce_Abery's very nice knurled nut and bolt, resized and cut them in the slicer, so they were how I liked them.

That's about it.

Resized and trimmed to make a nice flat plug, so the hotbox can still fold up with it installed