Auto Sampler - sample water from an outlet - motor

Hi this is an autosampler to automatically collect water samples from an outlet. It works by programming the stepper motor to rotate - one can use an arduino with a stepper driver, for example.
Insert 15 ml centrifuge tubes at the openings and program the stepper motor to rotate whenever you have finishing collecting a sample.
If you want to know how to build this model and use it check the full instruactions: https://www.hackster.io/vcantarella/auto-sampler-paul-the-open-source-lab-assistant-2df99e

Guide:
 

1. Print the parts
2. Insert the bearing balls carefully inside the cage
3. Attach the nema 17 stepper motor at the base with the M3 screws.
4. place the lid on top
5. connect the stepper motor with your arduino shield and program it (let me know if I can help here).