I designed this compact marker holder. The 2 rows are different heights so that you can grab markers easily. The organizer is also angled toward the user for easier reach. Fits standard expo markers loosely, and fits Pentel markers perfectly.
Uses 10mmx2.5mm magnets. Highly recommend cutting a small microfiber cloth and gluing on the back so it has some friction with the whiteboard (so it doesn't slide off easily).
You can customize the magnet size and/or the marker hole size with the STEP file.
Can print upright without supports.
Designed using OnShape.
The files also allow for customization and modification, so you can make derivative works.
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The author marked this model as their own original creation.