Plan B Thread Protector with Tapered Collar

Remix of 6creeder's Plan B thread protector (thing:5247438), with the addition of a tapered collar added to seat the protector against the Plan B mount taper, ensuring that the upper threads cannot become exposed by over-threading the protector.

Print with the upper surface of the tapered section on the build plate. Pro tip: print with a brightly-colored filament so you won't forget to remove the protector before use if shooting unsuppressed!