CNC spindle vacuum holder

For my CNC I needed some vacuum holder. This holder fits to spindle with diameter 52mm, but it can be used also any other diameter in +- few miilimeters.

I added step file so you can change and optimise by your needs.

Additional part is "brush holder" which will have glued brushes and all together will be glued directly to vacuum holder. I printed it but still didn't mount it.