Added cutouts for magnets, use as many as you like to make it as strong as you like, the magnets should just press in, however, a touch of crazy glue make them permanent.
These magnetic “helping hands” solder station are truly badass if you are interested (see the spool in below pic):
Magnet Sizes I used:
I also included the solid works file so you can change the magnet cutouts to any size / depth for any magnets you might have lying around quickly and easily.
Printing:
Obviously print this with the bottom facing vertically to await the need for any supports.
The author remixed this model.