Fully functional 1:10 optocoupler model

Fully functional 1:10 Scaled model of 4 pin SMD optocoupler or same package.
Inspired by the discrete 555 model, and decided to make one similar.
Couldn't find a model with hollow internal to fit components so I decided to make my own.
2 body and 4 legs required. Epoxy is optional, but eliminates air gap.
Black filament preferred to absorb as much infrared radiation to avoid environmental noise.
Insulation breakdown voltage ~100kV (could be improved by better insulation material)
(this model uses air)
Use any 5mm IR LED and 5mm phototransistor.
4 banana plug.
Thats it! no soldering required.

My channel for information soon:
https://www.youtube.com/channel/UC73LkQJ47rRI07iMOzu7-5g