Designed for the Spyder Tarantula Hole saw but should work on most any brand 4-1/4" (108mm) I have made it short for that reason and to save on filament.
I used .15mm Speed @ 20% infill I used no supports and you can see in 1 picture were I maybe should have but as a washer goes there anyway I didn't care to.
You will need a #8-32 screw, nut, wing nut, 2 washers & a fender washer.
The author hasn't provided the model origin yet.