as define here: http://objects.reprap.org/wiki/GCodes#G92:_Set_Position
G92: Set Position
Example: G92 X10 E90
Allows programming of absolute zero point, by reseting the current position to the values specified. This would set the machine's X coordinate to 10, and the extrude coordinate to 90. No physical motion will occur.
However, the implementation is like this:
this is exacly the wrong behaviour: it should set X Y Z A B C E etc. to their current values, unless they are issued with the command, in which case they should be set to their new value (usually zero).
This bug makes it impossible to use separate zero-ing steps, which is very useful for cnc milling/routing.
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