Magnetic Pin / Thumb tack

Magnetic pins for use on magnetic pinboards or any other magnet-friendly surface.

This requires a 9mm(dia) by 3mm(high) neodymium magnet to be press fit inside the cavity. I used this one: (Amazon link)

Tip: you can put some strong glue in the cavity before putting the magnet for a stronger hold.

Print instructions:

I printed it upside down, so it doesn't need any support, but you can change the orientation if you like.