I used some round magnets on the fridge to hold up blank shopping list forms. It was always a pain to have to move the magnets out of the way to get the top-most sheet. Figured a holder would be nice since it was simple and I'd just gotten the printer. First did the "I" shaped one but didn't like the feel of it (the wife did though). So, I created the round topped one next.

There is a slight recess in the floor of the magnet area to help hold it into place.

Wanhao

Wanhao Duplicator i3 V2

No

Yes

.1

20

I don't think the resolution needs to be that small, it was just one of my first prints so I wanted it to look good. Infill was for the space where the magnet would be inserted.