pipettes
https://www.thingiverse.com/thing:159052 simple 4 parts uncalibrated no tip thrower


reasearch paper https://www.biorxiv.org/content/10.1101/109231v1 and https://github.com/Biological-Microsystems-Laboratory/micropipette uses a seringe and it's hard to calibrate
https://www.thingiverse.com/thing:2790497 side one based on biropipette seems OK, has a lever action
https://www.thingiverse.com/thing:2400770 another seringe one
https://www.thingiverse.com/thing:2781997 eppendorf plastic broken 3d
https://www.thingiverse.com/thing:824671 counter
https://www.thingiverse.com/thing:1118334/comments  never printed counter