Portable Grinding Disk Holder

This is a grinding disk holder I designed, although I am sure there are more out there already like it as it's simple (please feel free to leave links to similar design in the comments for other creators), to hold 4.5" portable grinding disks for transport and storage to mitigate chipping and damage. It was born out of throwing away disks stored in an emergency vehicle as they bounce around alot in the bag inthe cabinet in which they are stored. It was printed on a Qidi Plus 4 in Hatchbox PLA. The walls of the holder are 3mm thick and metric Fusion threads were generated on the spindle and the holding plate hub. 0.15 and -0.15 hole offsets were input in Orca Slicer to make the threads work properly after printing at 0.16 layer height.  I used Magigoo so I did not need a brim. It's a version 1 model so  I am sure with some input there will be changes. I added windows to see the disk, to help with spinning the holding plate on and keep a piston effect from happening (I/m not sure it would have but it was in my head). Plus the opening used less filament and made it lighter. Please remix it and let me know what you think or if you have suggestions.