Ajusting Z axis height

Hi there Arduino people , I would like to raise the Z axis height on my Rep Rap , it can be done mechanicaly ,but I have read and read and searched for info of how to get the required height increase, Then some bright spark said you can alter the height via your Arduino program . And I asked him and he said he did not know ask you clever people ! Hope you can guide me through it , !! Great Forum looking Forward to the answers , Harry

Hi Folks , hope you can help me !! My Germany RepRap V3 Protos was running perfect until now ! The Y axis is moving Forward after every layer ! I have down loaded my Simplfy 3D program just incase it was that, but no still the same . Any suggestions of whats Happening and how to overcome it ?

There are no simple answers to your questions. You can install the latest firmware, and ask in a RepRap forum about known bugs.