I designed this adapter to use Dyson Animal attachments with my 2.25" hose Shop Vac.
For reference - if you have another reducer application need, the actual CAD geometry adapts from 2.275"ID to 1.35"ID. The Dyson side has a draft that goes from 1.35-1.36" for best fit. You may need to print a test cut in your slicer to confirm fitment.
Printed in Overture Space Grey at 0.3mm layers, 3 perimeters, 10% rectilinear infill. No support needed.
The author hasn't provided the model origin yet.