A few comments if I may.

1. Your thread heading is misleading - I have no idea this was about filament - plastic and filament in 3D printing terms are different. I only looked as I am machining plastics but as I own a 3D printing business, this is interesting ...
2. Your filament might be good but there is a lot of competition.
3. Your price is expensive, this is even before shipping to Europe. Have you done the maths?
4. 1.75mm is not as commonly used as 3.0 mm in Europe ..... you product at 1.75mm removes more than half of your potential client base - why not do both sizes?

Just my 2p ....

Regards