This case meets following needs of mine.

• Carry on contacts on airflights
• Store a backup in the fridge

… while hydrogen peroxide solution is still making bubbles. You want to avoid

• airtight containers, but also
• leaking solutions.

(Well, there is no guarantee, of course!)

There are 3 variations.

  - One contact type A (thick lid)

  - One contact type B (thin lid)

  - Two contacts type A (thick lid)

Tested with PLA 0.2 mm and 0.3 mm layer height.

I'm sharing Fusion 360 design files too for easier remix. Enjoy!