I have the same slides as plbarrio (https://es.aliexpress.com/item/A-Set-Plastic-Prepared-Microscope-Slides-Animals-Insects-Plants-Flowers-48pcs/32773548174.html), and I'd like a storage solution, so I remix the original:
For the lid I used only one layer for the bottom, and no for the top. The hexagon infill give enough strength, but with the transparent filament give a transparent effect.
(I used the same config for the bottom, just to see how can i reduce the printing time and filament usage)
The author marked this model as their own original creation. Imported from Thingiverse.