http://www.retrotechnology.com/herbs_stuff/clean_disks.html There's any number of Web pages about dirt and cleaning dirt on magnetic media. My site has collected what I think are reasonable practices. I've not discussed 3D printed "disk cleaning frames" as they did not exist until recent years; I'll add that information. Regards, Herb Johnson -- Herbert R. Johnson, New Jersey in the USA http://www.retrotechnology.com OR .net preserve, recover, restore 1970's computing email: hjohnson AT retrotechnology DOT com or try later herbjohnson AT retrotechnology DOT info