Waterproof box vial insert

This insert is designed to secure four 2 ml medication vials in a [Sailrite Waterproof Box](https://www.sailrite.com/Waterproof-Box-Small). A cutout in the bottom makes room for a strip of [3M Dual Lock](https://www.3m.com/3M/en_US/dual-lock-reclosable-fasteners-us/) to secure the insert. A flathead screwdriver can be inserted into slots on either side of the insert to remove it from the box.

`Box insert.stl` should be printed in a rigid filament like PET-G. `retainer v3.stl` should be printed in a flexible material like TPU. I used Overture PET-G and PolyFlex TPU90.

Print the insert upside down and the retainer flat. Assembly should be self explanatory.