thingiverse
Whiteboard marker holder created with Vectary - free, online 3D modeling tool: https://www.vectary.com
Feel free to customize it. https://www.vectary.com/u/adrianm/whiteboard-marker-holder
I made a slot into the back of holder for 12x6x3 mm neodym magnet to hold the sponge on place.
Direct link to the original creator's page
Click the "View on thingiverse" button above to visit the original model page on thingiverse. You can download the STL file directly from the creator's page for free.
This STL file is compatible with most FDM 3D printers (Creality Ender 3, Prusa MK3S+, Bambu Lab, etc.) and resin printers (Elegoo, Anycubic). Check the original page for recommended print settings and materials.
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Most STL files can be modified using free software like Blender, TinkerCAD, or Meshmixer. Check the license on the original thingiverse page to see if modifications are permitted by the creator.