This is an insert that converts your empty coverslide box into a storage box for 5 prepared coverslips. The insert is made to hold 0.15 mm thick 24 × 60 mm glass coverslips (010124, Marienfeld Superior) and fits into the box they come in.

Source code (.stp & .3dm) is also provided, should you want to modify the design for your own purpose. Please share your prints!