In addition to Labern's suggestions: print slow and warm enough, and minimise cooling, so the layers do bond as well as possible.
I have made things like that in colorFabb PLA, and they worked too, if not used frequently. And only for a few months, until the PLA got harder and more brittle, after which they broke. So it may work in colorFabb PLA for a prototype to show off, or for a single snap-on fixing that is never to be released again. But not as long term solution for frequent use.
PET is much more flexible, but may also break along layer lines. You will have to try.
Editing your design to increase the traject is also an option, like adding some U-turns or sine-waves. But in my experience PLA will always get brittle over time (a year or so).
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Labern 775
A form of PET or co polymer should work. Most companies have different names to differentiate them selfs from the rest by putting in additives.
CPE, CPE+, PET, nGen, XT, PETG, and the list goes on.
But with your design, its weakness is in the layer adhesion which is not the strongest way to print an item. You could make those tabs separate that you print lying down and then insert and glue them into your main lid. Or just redesign how the tabs work.
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