The Shark Rotator (NV501) is a great vacuum, but it uses a custom diameter for it's attachments.
These adapters will mate the 36mm OD tube of the Shark to:
- 1.25" vacuum attachments
- 2.5" (2.25" ID) Shop Vac attachments
- 35mm ID attachments (like this)
Unlike some I found on Thingiverse, these will actually fit. The adapters are slightly tapered, so the precision required is not that critical.
PETG works well as the layer bond is strong.