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I made this custom case for my 3D printed spectacles:
It holds the glasses by the edge of the frames, so the lenses are suspended above the bottom of the case without touching anything and no padding material is necessary to prevent scratching.
And being specially sized for those glasses, the case is no larger than it needs to be.
Did I mention that I love 3D printing? 🙂
I printed a sunglass case sorta like this but way less engineered. Mine also has exposed magnets but curious if you considered embedding them into the print with just a couple bridging layers printed over them? I've seen magnet cases like this eventually have the magnet overcome the glue and pull out.
Halting the print to insert the magnets would be problematic: I print on the company's printer and it's a 5-hour print, so I start it before going home in the evening to avoid annoying everybody during work hours.
We're allowed to use the printer for personal prints. But the rule is, if someone arrives at the office and needs to print something for work, whatever private stuff is in the printer is removed to make way for work things. And of course, if the printer is running - or paused waiting for someone to attend to it - the print is cancelled.
So I'd have to arrive really early in the morning to make sure I get there before the most early birds but there are no buses at the wee hours of the morning. Therefore realistically, my long prints need to complete unattended and be ready to be chucked out in the morning if I'm not first to arrive at the office.
But I'm not worried about the magnets coming out: the fit is tight and I use really strong epoxy. I've yet to see anything assembled with that stuff come undone.