Cable Plug for "Retro AppleWatch Charger stand"

This is an accessory to an existing watch charging stand (link). I quite like the look, but I wanted to make a small plug to hide the hole for threading the USB cable through the part. 

Using the original STL, I was able to extract surfaces and remix this extra cover to match the curvature. 

It slots right in easily and does not require any disassembly to install or remove. Could be used to add a splash of colour. If I have time I may try adding texture or thin the plug to be more subtle.