Das Filterproblem habe ich auch 
Ich habe mich dann gestern (Samstag) an den Support gewendet hier mein kurzer Austausch dem dem Support Team:
Dear Fitcamx Support Team,
I wanted to install my camera in the EX30 today, but I noticed that the CPL filter doesn't really fit on the housing of the Camera. Is it too big or maybe the housing is too small?
I have attached a couple of pictures. Can you help me further?
Hello,
That is normal. The CPL use 3M tape and it can fixed on dash cam.
Best regards,
Xyla
FITCAMX Support Team
Sorry, but the CPl is so big that it sticks out over the housing, see photo, that doesn't really seem premium like to me. I don't like that!
I am sorry about that. Because we test all CPL to see which one is suitable for EX30. Only CPL-3869 is compatible.
Best regards,
Xyla
FITCAMX Support Team
According to the sticker on the housing, it should be the aforementioned CPL. I also ordered it in a package with the camera and Fuse Box cable. Nevertheless, I am not satisfied with the way it is now, and I rule out using the camera without the filter.
I will pass your message and suggestion to tech department.
Best regards,
Xyla
FITCAMX Support Team
Da werden wir wohl zunächst mit leben müssen, trotzdem schön geht anders.
Ich habe meinen Einbau nun auf nächsten Samstag verschoben.