Focuser works better than expected and is mainly used during imaging planets and DSO objects. Focusing by hand at that time is less accurate and almost impossible. The whole project costed me few € because I already had everything at home except a shaft coupler.Link to a source code for the focuser. Fell free to use, improve and comment, your feedback is desired.
Here is a picture of my telescope focuser with one of the focuser knobs removed and motor focuser attached instead of it. The motor’s and focuser’s shaft are joint directly by a shaft coupler.
Helpful links at building this device: