Geocaching container with PET-cork, like Mats E container, just with 8x3mm magnets instead of 12x3mm
outside: 30x30x85mm
inner diameter is 21.5mm x 82 mm
1x PET-cork
3x Magnet 8x3mm
I printet it our of PETG with the 0,2mm quality setting (3 perimeter and 15% infill) an it tourned out perfect. In my case, no post-processing was required. Of course you can also give PLA a try but I thought PETG or ASA was the best because it will last longer outside.
I used a bit of super glue to secure the magnets in the container.