Individual Expo Marker Clip

I found a lot of cool Expo marker whiteboard mounts or trays on Thingiverse, but none of them seemed to be individual clips. I like the convenience of being able to place any particular marker on the board anywhere after use, especially in the middle of teaching. These clips fit normal Expo markers as is and can be reused when the marker dries. I used neodymium magnets that are 6mm (diameter) x 3mm (height). However, I've included the Fusion 360 file here so you can customize it to your own magn