I made this for my wife to be able to sew some smaller products for her Etsy page. She needed a loop that was 1.5 inches and the ones she saw online were very expensive. So she asked me if i could 3D print it for her and of course I said definitely.
I used really small hex bolts from my 3D printer extra parts to join them at the top but you can get really small screws at your local home improvement store or of course Walmart, just be sure to bring the loop with you to check the size.
This is the 7th & final iteration. It is completely functional once you add a screw. If you sand the outward side of the inner ring & the inner side of the outer ring you will get a perfect fit, however it still functions pretty well without sanding.
I used A Robo R1+, White & Bronze PLA temperatures: 219C & 53C print bed, at 25% infill with No supports.