I accidentally bought the wrong size tape and didn't want to return it since it was so cheap, so I made an adapter so I can use it in my smaller dispenser.
Inside hole diameter is 1.5" for the standard small rolls, and the outside diameter is 3" to match the standard larger rolls. The width is 1.9" which matches both rolls.
If you load the model and it is way to too small, scale it by 2540% because it was designed in inches. I converted it in Slic3r so this should no longer be an issue.