Summary

A gcode interpreter with x, y, and z axis that can be used with ReplicatorG. It builds on the existing 2-D gcode interpreter by Oliv4945.

Instructions

This is a very basic g-code interpreter that implements the G00, G01, and M114 commands - enough to draw with a marker, including pen lifts, using the output from a text to g-code program.
I setup the serial replies from the arduino in a basic reprap format to allow ReplicatorG to send the g-codes. This requires that the xml file be copied the the machines folder in the replicatorG directory and the tinycnc be selected as the machine type in the machine menu.

Additional Notes:
The interpreter does not remember the previous command - only the previous X, Y, and Z values. A line of X,Y, and/or Z values requires an associated command. It should however correctly handle multiple commands on a single line.
The program includes a defined backlash value of 1 degrees that can be easily changed.
Getting clear text from a marker will probably requires a couple rounds of adjustment to the Z values used the the g-code. Excessive pressure greatly increases the play in the mini CNC (at least in version 0.29).

Arduino Gcode Interpreter for MiniCNC with Z Axis