this is suitable for shower rods under 35mms in diameter. The screws might be tight at first, but after making it go back and forth, it should bore itself in. if your printer is not good with tolerance and clearance, scale down the screws in X AND Y ONLY just a little. Cheers! a like would help
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*the screw threads are designed counter-clockwise!!!
*you do not have to use both of the screws, only one is better if the rod is not so small.