Whiteboard eraser with slots for four fine-point Expo pens

thingiverse

This is the body of a whiteboard eraser designed to be just the right size to hold four of the smaller, more slender Expo whiteboard pens -- not those big fat ones, but the fine points (like the ones pictured). There's a square-cornered version, as well as one with some curves. I've also included the Google SketchUp 2013 files for remixing (and here, the square one will be more useful -- I find it's much easier to remix the square one and then re-add curves than to work with the curve version). Instructions Nothing special required to 3D print this. You'll need to glue some felt onto the big flat side yourself, of course. You can use any thick felt from a crafting store, or buy a cheap eraser, cut the felt off, and glue it onto this. (For example, http://www.joann.com/felt-eraser/xprd1132199/).