Shopvac hole saw dust shoe

thingiverse

This is a handy dust shoe or collar designed for attachment to a shop vac to efficiently pick up dust when using a hole saw. It can accommodate diameters of up to 3.5 inches. You may need to resize the nozzle so that it fits snugly onto a different size shop vac hose, as it was originally designed for a 32mm diameter hose. Printing the collar upright on its nozzle end appears to result in successful prints without the need for supports.