Hello suds, Under ReplicatorG’s “Machine” menu select the “OnboardPreferences” item. In the resulting window, select the “Homing/VREF”tab? Change the values andthen press the “Commit” button. Note, it may take 10 to 15 seconds to update. Also the exact valuesyou entered may not be precisely what is saved: the printerconverts the values to units of stepper motor steps. Whenconverted back again to units of millimeters for display inReplicatorG, the values will be slightly different. This is normal.