Whiteboard eraser with slots for four fine-point Expo pens
thingiverse
This whiteboard eraser accommodates four Expo fine point pens, preferably the slender variety. Two versions are available: square-cornered and curved. The square design is more suitable for remixing using Google SketchUp 2013 files. Post-printing, attach felt to the flat side using glue from a craft store or by repurposing felt from an existing eraser. For instance, Joann's offers various felt options (http://www.joann.com/felt-eraser/xprd1132199/). 3D printing requires no special procedures.
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