Comment by kvemkon

Then I'm surprised. It's much different to the usual situation when even mass made products are either banned or very limited, e.g. unicycles prohibited, e-scooters only up to 20 km/h, e-bikes only up to 25 km/h.

Regarding 3D made parts recently there was an accident: https://news.ycombinator.com/item?id=46152941. One may expect increasing regulation. At least in the air.