My Customized Biropette: customisable, high precision pipette.
thingiverse
A customized version of this pen holder is available at http://www.thingiverse.com/thing:255519, which can be personalized using the Customizer tool (http://www.thingiverse.com/apps/customizer/run?thing_id=255519). To print it, set Show_crossection to 0, biro_radius_tip to 1.7, Range_membrane_pin to 3, screw_radius and shaft_radius both to 2.5, Tolerance to 0.3, Range_Z to 10, Range_steps to 10, and enable Expunger with a biro_radius of 1.8.
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