Hey Arbo I went ahead contacted ahren at CRP and had him give me a quote on all the parts needed for the z-axis. I decided on using a R&P on my x and y on your advice. I ordered all the parts I needed and have built the z-axis already. I'm just waiting on my 4 axis plug & play electronics I bought from CRP. I really don't know how to wire my own so that's why I dicided on the Plug and Play system. Without a motor its hard to finish my z-axis because of the distance between the coupler and bearing block it's not aligning. I still need more parts but I'm very excited with all the progress I have made with my machine. Reading all of your threads on the different projects you have done has made me kick my build into high gear. If everything goes the way I wanted, it should be finished by the summer. Thanks for your advice.