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no extrusion delay, just that a pre-contour extrusion and post contour retraction needs to be done, add useful tools for testing (#10, #16)

extruding at the same time, there is a significnat delay (slightly less than the 5s in code) with extrusion), calibration must be done again (too far above the print bed (#10)

controlling extrusion and movement simultaneously, need to get extrusion length from contour data, significant delay between commmand and control (#10)