Like most people I have machines (saws, router, planer, router and more) that each have a different size of dust extraction port (why??) - which makes connecting hoses problematic. My brother has a 3d printer and has offered to make some bespoke items for me BUT it seems that the file to use (or creating it) is the hard part. Does anyone have sources for any files - or any other ideas etc - that may be useful please? Rob