Improved Parametric Zip Toggle

1) Added grips to one side of the tab for ease of use
2) Rounded the edges of the ring

Printed and confirmed it works, grips are good. Only added grips to 1 side to make it easier to print.

The only modified version currently available is the improved version of the 0.5mm tolerance file.

After printing, I found I needed to use my clippers to trim the sides of the barbs on to get it to fit together properly.

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