Spinbrush head cover, scale for any toothbrush.

This is a cap I made to cover a spinbrush electric toothbrush. You could scale it for any toothbrush. The inside width is 12.7mm. If you need to scale it to your toothbrush, I'd scale it to 0.2mm smaller than the width of your toothbrush so it's a snug fit. For instance, if your toothbrush width is 12mm, try scaling the print to 93%. A 7% reduction should yield a 11.8mm inside width. Please post your makes and comments.