Designed this so my medium size rigid shop vac (1 7/8od) could mate up with the dust port on my Dewalt miter saw. Thought they were the same size but the Dewalt side is a bit smaller. There's a Dewalt "D" inset on the inside of the adapter so you know which side is which. Press fits perfectly for me but you may need to adjust a bit for your printer. Ridges added for strength.