Curtain Hook for curtain rings

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These curtain hooks clip onto curtain rings (designed for rings of 9mm width, but should accommodate slightly smaller or larger without scaling) to allow the traditional white curtain hooks to be used to hang curtains on a curtain rail (see photo). 

 

I made them because the original hooks that came with my curtain rail had broken. 

 

I printed in transparent PETG to match the originals, but have also printed in black PETG without issue. I have not tried in PLA but they would probably be fine. Print profile has 100% infill and I used concentric infill and surfaces to attempt to add strength to the clip part. I've been using these for around 3 months and none have failed so far. Each clip is less than a gram of filament. The uploaded profile contains six copies.