So I've bought a Samyang 12mm f2.8 for astro shots and I'd like to use a light pollution filter on it.

Apart from the fact that nobody offers a holder for it, yet, if ever, these types of holders, and the correspondingly large filters, are very expensive.

In my internet wanderings I came across this YouTube video of a 3D printed adapter for the lens that allows you to use circular filters.

https://www.youtube.com/watch?v=JE5x02beOSY I'm trying to contact the guy to see where he had it done.

Does anyone know about 3D printing? Is it expensive for a one-of?