SimRail Radmor style USB Microphone

SimRail, a very realistic, multiplayer train driving and signalling simulator from Poland, 

As the simulator is multiplayer you can talk to the dispatchers and train drivers with live voice as if you were using the train's radio, 
Like a real radio, you need to hold down a keyboard key to ‘key the mic’ and talk.

In the older trains (EU07, EP08, ET22, EN57 etc) they have an analog Radmor radio set, with an iconic (rounded coffin shaped) microphone. 

This project allows you to make a Radmor style microphone that simply plugs into a USB port on your computer, when you press the PTT lever it sends the 'talk keybind' and the microphone inside it sends your voice to the other people in the sim.

The 3D parts are pretty simple to print, in the .zip file you will find a ‘ReadMe’ file that covers every aspect of this project that i could think of (apologies in advance for it's length) 

Also in that .zip file are photo's showing how to lay the parts to print, where to apply supports, a Prusa Slicer project file that has all parts laid out and supports added except the microphone grill… as that should be printed in a different colour to the rest of the mic, as well as all the .3mf / .stl files that i have posted here (so the Printables 3D viewer can render them)

As this project has electronics in it you need to purchase a few items to get this microphone operational.. I paid around £30 for all the parts, but you can likely source them cheaper.

Almost everything is plug in via USB, the switch board does need a MX style keyboard key soldering on it.. it's just 2 simple solder joints in this whole project. 

The readme file contains links to amazon items showing what you need to buy, you can very likely source these items elsewhere cheaper with longer shipping times, 
These are NOT affiliate links or anything, it's just handy links that show exactly which parts are needed.

The parts are:

The internals of the mic are based around a cheap 3 port USB hub (£4.50)

Into this hub a USB microphone dongle plugs (£6.70)

And also a single key microcontroller board is plugged in (£10+)*

An MX style keyboard key is needed to be soldered to the above board (£2+)

Then a coiled A to A USB extension (£8)
This  provides the link from the mic to the computer, allowing you to grab the mic and the coiled lead will stretch as you move it just like a real radio mic's cable does. 

*The main item is the single key microcontroller board, which is an ‘Adafruit NeoKey TrinKey single button USB board .. Ada 5020’ 

Unfortunately for people in the UK this board is harder to find now that ‘the Pi Hut’ are out of stock (they sold it for £6.99, with £3 postage) 
it can be purchased from amazon, but it will come from america so it costs £17 and takes a week to get here they say :(

Of course please shop around to try and find the parts cheaper, just be sure you get the same USB hub and TrinKey board that i used so things fit in the 3D printed cases.

The NeoKey TrinKey is programmed with circuit python, in the ReadMe i detail how to do this, it's quite simple, you basically need to download a file from AdaFruits page, copy that to the Trinkey board. 
Then copy and paste the 2 code files i provide, and the board is set up to send the standard key SimRail uses for the Push To Talk keybind, 

Instructions are included on how to change that keybind on the TrinKey if you prefer to use a different key bind.