My workshop hoover has a 3.5cm diameter connector that doesn't quite fit my mitre saw or other appliances. I could go and buy a connector but:

• they're expensive
• I have a 3D printer

These are the first two connectors I've designed. They're printed in TPU so they've got a bit of give and stretch to them and they cost almost nothing to print.

If there's a size you're looking for message me and I can create one for you.