Accessories for a shoulder bag

I have a shoulder bag that I normally carry over one shoulder. It has 2 disadvantages:

1. It always slides from my shoulder
2. The straps are not really secure, it loosens over time, lengthening the strap.

Being a “maker” with a 3D Printer I designed quickly the solutions below

1. a clamp to secure the bands
2. an anti slip pad

Both designs are easy and very basic. They can be printed with 0.1 and 0.2 layer and 0.4 mm nozzle.

The clamp I did with PET (0.2 layer), the pad with TPU (0.1 layer because of the fine pins).