Penholder for integral calculus
thingiverse
Customized version of http://www.thingiverse.com/thing:722071 Created with Customizer! http://www.thingiverse.com/apps/customizer/run?thing_id=722071 Instructions Using the following options: Center Bowl Option Selected: no Bowl Depth Adjustment: 10 units Center Hole Option: yes, enabled by default Hole Diameter Setting: 10 units in diameter Number of Pens Set to 12
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