Came across the Filament Clip made by motoz and ended up really liking the design. The only problem was that it wasn't gripping tightly enough when printed in PETG.
So I made a remix where i angled the ends inward to give it slightly more grip and I also added a small chamfer to make them a little smoother around the edges and also to avoid a bit of elephants foot on the first layer.

I've been using this clip for a few weeks now and I have yet to encounter any problems with them, they grip perfectly each and every time.