A simple curtain eyelet design. The model is parameterized and only needs one value, the diameter of the inner ring. All other dimensions are calculated relative to this value. This design was inspired from https://www.thingiverse.com/thing:1570892 but has been designed from scratch. The Fusion 360 project can be found here

https://a360.co/3fWQJpx

Printing:

I have printed with a 0.3mm layer height with a 15% infil for the ring area in both front and back pieces and with a 70% infill for the hook area of the front_piece.