I wanted a magnetic hook to hang things on metal surfaces like a refrigerator so I made these. These can hold quite a bit of weight.

Parts available at
http://www.leevalley.com/

1/2" Magnetic Cup 99K32.53
1/2" High Friction Disc 99K34.52
1/2" Magnet 99K31.03
Brass cup holder (Home Depot)

MakerBot

MakerBot Replicator 2X

No

No

0.2000mm

35%

ABS plastic 2 shells

1) 3D Print plastic part
2) Using vise, press magnetic cup into opening. If opening is too big, secure with a #5 screw.
3) Put magnet in magnetic cup
4) Apply high friction disc
5) Drill small (1/16") relief hole to mount cup holder
6) Screw cup holder into plastic piece