I typically start jobs by moving the tool to the top of the workpiece (as shown in 360.png below). The issue is, G92 doesn’t work in Repetier Host. My solution: disconnect and reconnect in Repetier. This sets the axes at X0 Y0 Z0. This seems to work most of the time. However, sometimes after the disconnect/reconnect, the gantry drops. In the mpcnc.jpg below, the shadow shows how the mill dropped from the start position after disconnecting.
How can I get G92 to work? Or, how can I prevent gantry from dropping?
Other info: RAMBO board (not sure which version- how would I find out? bought from V1 ~1.5 years ago) seems to be running Marlin 1.0, Repetier 2.1.6
Grateful for your help. Thanks!