Just a simple case.

thingiverse

I designed this prototype as an all-purpose case for storing random items. The printed cover can be somewhat stubborn when it comes time to put it on or take it off due to minor variations in the plastic material. To mitigate this issue, I've found it helpful to use an exacto knife to gently soften the edges before attaching the lid, making it easier to remove once the job is done. I consider this a work-in-progress model, as I continually fine-tune and make adjustments to get it just right. Future iterations are probably in the offing.