Make sure to print with supports.

The magnets that fit: 5x2 mm Mini Tiny Round Magnets (https://www.amazon.com/gp/product/B09SW9BQ2D/ref=ppx_yo_dt_b_search_asin_title?ie=UTF8&th=1)

This fits floss picks, Q-tips, jewelry, ...

I would recommend using a small dab of glue when setting the magnet. I find that using the back handle of a screwdriver works well for pushing the magnet into place.