Print it 0.24 no supports. change the hose connector to whatever size your dust collector hose is. I wouldn't go to much larger than  what it is right now. All dimensions are derived from the embedded spreadsheet so if you want shorter sleeves or a smaller/larger hose connector change them in the spreadsheet.

The outer perimeter of the sander side could use some refinement if you wish. 

Printer: Creality ender 3 s1 pro using PLA