Journal Pen Holder by kmbs - Thingiverse

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pen holder by alavanimation - Thingiverse

Double pencil cup / holder by jdobry - Thingiverse

Posca Markers Holders by J-Max - Thingiverse

Pen Holder for Moleskine Hard Cover by blatterjr - Thingiverse

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Pinterest

Moleskine Notebook - Pen Holder by tokyo - Thingiverse