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Macros allow you to create conditions and evaluate math equations in the Custom G-code fields.
or
Inside either construct, PrusaSlicer configuration variables can be accessed by their names
and elements of vector variables can be accessed by using square braces
refers to the temperature of the first extruder.
Multidimensional vectors can currently be only accessed as a simple vector variable resulting in a string value (e.g. if the extruder_variable[1] resulting in [n,0] string value -- can be posted in g-code but can not be used in arithmetic operations).
Strings are identified by double quotes and regular expressions by slashes Strings are not parsed recursively, i.e. curly and square brackets inside strings will appear in the output. This allows constructs such as
The following operators are allowed:
Minimum
Maximum
Casting to integer
Rounding to an integer
Rounding / padding with spaces: rounds fractional part to num_decimals digits (adding trailing zeros if needed), then left fills with spaces so the number has num_digits characters in total (including a decimal point if present). Last argument can be omitted, defaults to zero.
Rounding / padding with zeros: same as above, only left filled with zeros
Check if the configuration option is active
You can use variables inside customs scripts and in the output file name template.
Check the List of all PrusaSlicer placeholders, grouped according to their scope.
These values are scalar and can be directly referenced.
Some variables are defined by complex formulas. For example, the perimeter_extrusion_width if left to zero takes the value of extrusion_width if non zero, otherwise a default perimeter_extrusion_width is calculated for the current layer_height. These substitutions are only done for the new syntax expressions (enclosed in curly braces {}), while the expressions written using the old placeholder syntax (enclosed in square braces []) are interpreted verbatim.
These variables are arrays and need to be accessed as such (e.g. temperature[0]).
These variables can only be accessed as simple vectors and can not be used in arithmetic expressions.
Examples
You can use the "Before layer change" custom G-code to slowly decrease hot end temperatures. First, one may use the if/elsif/else expression:
The same result may be achieved by a shorter if/else/endif expression together with a linear interpolation:
Or one may use the ternary operator:
If you have a bed that takes a very long time to get up to temperature you can shave off a little bit of waiting time by using "Start G-code" to heat up the bed to the destination temperature minus 5 degrees and then starting to warm up the hot end while the bed continues to heat to the target value: