I found some shapes of bottle were at risk of sliding back through this wine rack, potentially escaping to be smashed on the floor - so I designed these thin little guides/supports/braces that clip on between each loop for rounder bottles to sit on so they can't fall through. I use 2 per section so the bottle is more cradled.

No supports needed. 100% infill. I used PLA but you can use PETG for more strength. I found the clip ends to open up slightly after sever months of heavy bottles sitting on them, but I've had no failures yet.