Geeetech

I have a Prusa I3 Aluminum printer with Sanguinololu 1.3A controller.

I have changed the Z axis screws to a acme lead screw, instead of the stock wobbly M8X1.25
So I down loaded the Arduino IDE compiler V1.01 and the firmware Plusa I3 A sanguinololu.zip
Went in the configure.h changed the #define DEFAULT_AXIS_STEPS_PER_UNIT {85.3333, 85.3333, 2560, 115}
to #define DEFAULT_AXIS_STEPS_PER_UNIT {80, 80, 400, 95}
and compiled it and uploaded it with no errors or anything, after upload completed looking on the LCD display under motion it is still the same as the default setting.
To make sure that it did load I changer the "Plusa I3 A" to "My Plusa I3" and compiled it uploaded and it did change that,
so I'm not sure why the step size won't change.
to work around it I use the M92 command in the program, I would like to fix it in the firmware.
any help would be appreciated.
Thank's
Robert

I can change it through the LCD menu control-> motion-> steps and save it through store memory. And I tried your method, I found out after reinstall the firmware it will not change, but if you press restore failsafe, it will change to the value you set in the firmware.