YI 4K Adapter for 34mm filters

I use the Yi 4K on a multicopter and the best working ND8 filters are not those you have to buy for a lot of money from drone stores. Believe a very high quality-demanding photographer. :-)
You can get a very good glass ND filter for half the price in the photography sector.

After printing use the heated bed, lay the filter on it and screw the hot filter into the adapter, the thread is easily made, after cooling down you can use other filters too.

Attention:
I do not use the original len