Elegant bag clip, very strong, various sizes

I know there are a lot of nice bag clips here already, but I wasn't entirely happy with any of them, so I added another design. There are 3 sizes for clamping lengths of 65 mm, 90 mm and 120 mm.

#### My design goals were:
- stability,
- longevity,
- high holding power,
- easy operation,
- no notoriously weak hinges,
- easy printing,
- and last but not least a pleasant appearance.

#### How to use:
As a rule, it is enough to bend the clip on the closure by a **maximum of 1 cm** in order to slide a bag between them or to remove a bag. It is not intended to bend the clip to larger angles. Bending too hard can cause the clip to break.

To open a locked clip, please use one of the two methods shown here:
https://youtu.be/p4mRMj1A3TU

#### Print settings:
First of all - a **flexible** material must be used, such as **PETG**. I haven't even tried printing clips with PLA since I don't think they will work for long (PLA permanently deforms under tension).

I also recommend:
- line width 0.4 mm,
- layer height 0.2 mm,
- 3 wall lines,
- 4 floor and ceiling layers each,
- 25% zigzag infill.
- a z-seam positioned as in the print preview above.