Model originally uploaded to Thingiverse at https://www.thingiverse.com/thing:3101693.
I had a look at this part but I wanted something that would print easier (less support) and accept easy to change adapters that could be designed as needed.
This one has a completely flat bottom and very little need for support. Magnets used are from here 10mm diameter and 3mm thick. You will need 3 for the base and 3 for every adapter. Bolt is M6.
I made my own brush. Just print the part, use the hair from a cheap brush and glue it in the groove. After that cut it to length as needed. I made 3 different adapters with 3 different lengths.
Printed in ABS, 0.3mm layers and a 0.6mm nozzle. I tried with several settings and types of bits on plywood. Works very well or even excellent.