Made these adapters to attach the hose from a shopvac onto a sander from Amazon. The sander has two dust ports so I made a splitter so that both can be hooked up at the same time. The one file has the T-connector as a solid model, the other has it as two pieces to glue together as this allows for better strength in layers.

I generated supports for the inside of the adapter as well as for the flanges. Used 2mm flanges.

A series of Shop Vac 1-1/4 hose adapters I made to split a single vacuum into two feeds to a belt/disc sander. Has hose to hose (H2H) adapter, hose to sander (H2S), and a T connection in two pieces for easy printing. Simply glue the two pieces together with epoxy or superglue.

I recommend high infill or even solid to make it strong.

Made for this sander:
https://www.amazon.ca/WEN-6515T-Belt-Sander-Sanding/dp/B07KL4BQF5/ref=sr_1_8?crid=3A7425IFY92ZZ&keywords=wen+6515T&qid=1647740038&sprefix=wen+6515t%2Caps%2C96&sr=8-8

If you make it leave a comment and let me know what you think!