curtain's ring

Curtain's ring, made to be sewn directly to the curtains. (nothing else needed). 38mm inside diameter. The gap for the tissue is 1mm, but can be from 0 to 3mm.
There are not round bore, but rounded hexagon bore to be printed on any printer without support. Raft is not requiered. They are strong enough even in PLA quite empty for 3m long curtains, one ring every 30 cm.
Works very fine with 28mm rod, but should work below too.
I also prepared a 9 rings file to fit 200x200mm² plates.

I also provide support for the 28mm rod, which makes a full curtains kit, if you already have a 28mm rod and fabric.