Maybe I do have a different Oral-B IO but this one does not fit that well. The hole of the toothbrush does have a different shape. However with a bit force, it will hold it though.

Maybe I do have a different Oral-B IO but this one does not fit that well. The hole of the toothbrush does have a different shape. However with a bit force, it will hold it though.
@FJ_439655 You indeed do seem to have a different model. Mine also only fits in 1 direction. Don't know if that helped. Thx for printing anyway!