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GCode Macros
Variable Substitutions and Expressions in GCode Macros
current set of variable substitutions
All Modes "pre" and "post" (header/footer)
{top} = offset in mm of bed top Y axis
{left} = offset in mm of bed left X axis
{right} = offset in mm of bed right X axis
{bottom} = offset in mm of bed bottom Y axis
All Modes "post" (footer)
{time} = job run time (printing/milling) in seconds (fractional)
{print-time} = alias for {time} ... deprecated after 2.8
{print_time} = alias for {time} ... 2.9 and beyond
3D printing / FDM
"pre", "post", and other macros
{temp} = hot end temperature
{bed_temp} = bed temperature
{fan_speed} = active cooling fan speed (usually 0-255)
{material} = length in mm of material (filament) used
{layers} = total # of layers
{layer} = current layer number
{height} = current layer height in mm
{range(from,to)} = evaluated using {layer} and {layers}
{z_max} = max build height in mm
{z} = current z position
{e} = amount of filament extruded
Anything inside `{}` will be evaluated using full expressions including use of Javascript's internal classes and methods. Example: `{Math.min(layer/layers, 0.5) + 1}`
CAM
{tool} = CAM tool #
{tool_name} = CAM tool name
{time} = dwell time in seconds
{time_ms} = dwell time in milliseconds
{time_sec} = dwell time in seconds
{speed} = spindle speed
{spindle}, {rpm} = spindle speed (v2.7+)
simple algebraic expressions supported in the form
{token+n} {token-n}