this is a REMIX of
Geocaching container Mini - Watertight w. magnet
infact you need to goto the original location to find the lit that matches,
this one is modified to fit my Square 12 x 8 x 2.5mm magnets,
they are easy to get inside bycycle magnet lights, people throw those lights away all the time,
you will find 3 to 5 magnets inside the spoke mounted black plastic part, just crack it open.
Glue the magnet into the container hole using epoxy,
then paint the container with lit loosely mounted.
I print this kinds of stuff with screw lits, using 0.1mm layer height, 4-6 layers bottom, sides, top, and 25% infill, PLA or ABS works fine, if you paint them dark and they are located in direct sumlight, use ABS or other high temperature capeable plastics.
only use PLA if container is not located in direct sunlight
since PLA tend to change form if exposed to heat over 50-60 Celcius