828 Spool
This is a spool for 828 film cameras. I got all the measurements from the only original 828 spool I have, and you need 2 to make the camera work. I have not tried respooling film onto it yet, and the printed spool is a little tight in the camera I am using (Kodak Bantam 4.5), but everything seems like it would work.
This thing was made with Tinkercad. Edit it online https://www.tinkercad.com/things/dJQP5y0V3xd