stl_threads(1) on Linux
The text 8f39b52727c1, as Debian 13 (Trixie), Debian 12 (Bookworm), Debian 11 (Bullseye), Debian 10 (Buster) shipped it. The page shows this text now.
stl_threads outputs an STL file with male or female threads per the ISO metric screw thread standard.