http://goo.gl/33smG6
add two normal size ( 4 & 6 mm diameter ) of straw, and one 3d printing spring.
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Adjustable Volume Straw Pipette with 4/5/6 diameter size.
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Creative Commons Attribution-NonCommercial-ShareAlike
You can distribute, remix, adapt, and build upon the material in any medium or format for noncommercial purposes only, with attribution and under the same license.
Licensed under CC BY-NC-SA
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