I have recently become interested in focus stacking and although my first attempts were not too bad I have come to the conclusion that a focus rail is necessary if I want to get better results, a perfect DIY project! The project is now under-way and should be ready for testing in early April 2013, the idea is to produce a unit that can be made from cheap components and require the minimum amount of machining, although I have turned a couple of of parts for the unit I am building they could have been produced with hand-tools, not so pretty perhaps but it could be done, once the project is finished and tested I will post a description on this blog, I am trying to keep the total price to around £20 (approx. €20).
Update: 29/03. I should be able to show a preview of the finished unit within the next two weeks.
Update: 28/04. Unit finished, write up can be found here.