Laboratory Pipette

Modification and redesign of existing pipettes on Thingiverse to allow dispensing using commercial 200ul pipette tips. I have yet to calibrate it and measure its accuracy, but this will come down to the setting and fit of the lower gear. My dispensations of liquids have been very consistent so far.

The idea was to move from getting suction from a balloon membrane to instead using a plunger and a tube as I had difficulties with retaining the siphon pressure.

The things you need to get it to work besides the prints are the following:

3 o-rings (3 x 7 mm) in EPDM, Nitrile or other suitable material
PEZ dispenser spring or similar
Lubricant
Commercial tips, such as from Eppendorf

To print, use the highest possible setting for the plunger, gears and the pipette tube. I used 100% infill with 2 shells. Use 15% infill for the main body.

Prior to assembly, I suggest you have sand paper ready and try to assemble the plunger with o-rings and pass them through the