I prefer to store calibration samples of every used filament. For some reason I've found no models for holding flowrate samples. That's to many of them just to trow into some cell in a box so I've created a holder. One is enough for first or second pass set, two needed for both. Not sure about YOLO as I don't use them.

I've printed them with PETG on Neptune 4 Pro with some draft settings that I don't remember. As long as it faced bottom down no supports or any kind of special treatment needed. PLA also should work fine as is. For ABS some scaling probably will be needed.