Universal cinema 3d glasses

Ajustable polarisation glasses
you need to buy polarisation film
here to help you search for it:
https://fr.aliexpress.com/wholesale?catId=0&initiative_id=SB_20210915093053&SearchText=film+polaris%C3%A9

then you need to cut a 50mm disc of it...
You can calibrate your both lens to see your "phone screen" all black
(use backside if not working)
you can add a rubber band for syncing both lens...

please share your prints