by cpendlebury, published
This is a improvised pipette for DIY biology using a drinking straw. Use this to pipette small volumes until you get a real micropipette!
See it in action here: http://youtu.be/Q6cFps88G9M
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- Print StrawPipette.stl
- If necessary, clean up hole so straw slides in easily. The straw should stay in snugly, but shouldn't crush the straw.
- If required, sterilise some drinking straws.
- Insert straw and use pipette: i. Insert into liquid, cover top of straw with thumb. ii. hold thumb on straw while transferring liquid. iii. release thumb to dispense liquid.
- Change straw when you would change a micropipette tip.
It operates in the range 200Î¼L to 1000Î¼L, and with practice you should be able to reliably dispense liquid in 100Î¼L increments.
Volume dispensed = Ï€ radius of straw^2 depth into liquid