The marker holder for the fridge whiteboard snapped and I needed a replacement. The whiteboard is secured to the fridge by 4 1"x1" magnet squares in each corner. I designed a bracket to let the magnet through and secure it to the whiteboard.
It works for the whiteboard markers that I have, but would probably need to be modified for other markers. You could also make it a bigger basket than the single marker holder that it is.
The author hasn't provided the model origin yet.