This is an application of my other model: https://www.printables.com/model/459910-simple-parametric-box-fusion-360.
I created a parametric box, and then modelled the inserts.
I am using it with this polishing stone: https://s.click.aliexpress.com/e/_DDNtUT7 (it is an affiliated link, I am not getting rich with that, but it helps….lol)
The author marked this model as their own original creation.