marker holder
thingiverse
Customized version of http://www.thingiverse.com/thing:340178 Created with Customizer! http://www.thingiverse.com/apps/customizer/run?thing_id=340178 Instructions Using the following options: height is set at 50 nudge has been adjusted to 0.1 precision is maximized at 100 eraser_width stands at 55 thickness is maintained at 3 fastener_width measures in at 15 markers are precisely placed, four of them marker_ridge_height reaches an impressive height of 5 depth of eraser has been set to a robust 35 marker_rad holds steady at 10
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