peristaltic pump

I made it out from old computer junk.

This design is based on popular stepper motor, my design of model as below:

https://www.thingiverse.com/thing:2848314

Silicon tube was taken from some inkjet printer, therefore I do not know its detailed dimmensions, anyhow it is not crucial parameter.
Feel free to adjust dimmensions of the roller to let it fit your silicon tube!

all parts were printed by PLA, and it works.
I'm wondering how durable it is, especially the rollers

If you can,