This printer spool bushing will sit securely into your spool if your opening is 2" approximately. The points of contacts are so small that there is nearly no friction and your spool with move freely. The hole in the center of the bushings measures 1/2". The bushing anything securely between 2.75" and 2.25" deep as engineered.
Proven on: HATCHBOX, JUSTPLA, PUSHPLASTIC, AND MELTINK SPOOLS