You're right, my apologies, no need to be negative in a hobby we all do because we love it. These guys are making products and that is what keeps the sport alive, I retract my staement.
The parts are cool, and it's nice that 3D printing introduces an avenue for low volume parts without need of access to a machine shop. As someone who has designed, printed and sold parts in the past, I would be cognizant of the need to up the level of finish a touch in relation to the price. The definiton of the STL is lower than I would expect, which is why the circle appears as a polygon instead.
I would be slightly nervous about the ASA and its exposure to petroleum, but if these are just choke cups I wouldn't be concerned. Prolonged exposure to petroleum can make ASA brittle and flaky.
The packout insert, however, is wicked, and I think this is an area where 3D printing is almost unbeatable.
In retrospect, I apologise for my negative comments, and in fact if anyone would like some 3D printing tips for their own parts I would be more than happy to guide people in the right direction.